Disabling cookies will prevent some websites from working correctly, and may mean that you are prompted to re-enter information that would normally have been stored in a cookie. To enable cookies, follow the instructions below for the browser version you are using.

Google Chrome
Click the 'parallel bars' menu button, choose the 'Settings' option, then scroll down and click 'Show advanced settings'. Alternatively for older versions of Chrome choose 'Options' on the 'Customize and control' menu, then open the 'Under the Bonnet' tab. In the 'Privacy' section, click on the 'Content settings...' button and open the 'Cookies tab. Set the required cookie behaviour and use the 'Exceptions...' button (if required) to configure specific websites.

Firefox 7.0 +
Use the 'Tools->Options' menu item (may be under the Firefox button or 'parallel lines' menu button), then choose the 'Privacy' tab. Set the 'Firefox will:' option to 'Use custom settings for history'. Now you can choose whether cookies are enabled for websites you visit and third party websites, and if so how long they will persist. You can also use the 'Exceptions' button to override the settings for particular websites.

Firefox 3.0
Use the 'Tools->Options' menu item, then choose the 'Privacy' tab. Here you can choose whether cookies are enabled, and if so how long they will persist. You can also use the 'Exceptions' button to override the settings for particular websites.

Microsoft Internet Explorer 8.0 - 11.0
Select the 'Tools->Internet Options' menu item, and then open the 'Privacy' tab - you can then adjust the slider to block or allow various categories of cookie. Alternatively by clicking 'Advanced...' you can exercise finer control over the browser's behavior, choosing whether to accept, block, or prompt for cookies originating either on the website you are visiting (first party cookies) or originating from websites other than the one you are visiting (third party cookies, typically used by banner advertisements hosted on an advertiser's website).

Microsoft Edge - Windows 10
In Edge, click the three dots/lines button in the top right corner, then select 'settings' and 'view advanced settings'. In the Cookies section you can choose whether to allow or block cookies from various sources.

Opera
Launch Opera, click the main Opera button in the upper-left corner of the browser window and select the Settings option from the drop-down menu. Then click the Privacy & security panel located on the left side of the resulting window. Enable cookies - Check the bubble directly left of the Allow local data to be set (recommended) option beneath the Cookies section to enable browser cookies.

Apple Safari
Choose 'Preferences...' on the 'Settings' or 'Edit' menu (Windows) or the Safari menu (MacOS), then open the 'Privacy' tab. Now set the required cookie behaviour.

Apple iOS (iPhone, iPad)
From the home screen tap the 'Settings' icon, then choose 'Safari'. Find the 'Accept Cookies' option and set the required cookie behaviour.

Android Browser
Tap the 'Internet' icon to start the browser, then press the phone's menu button. From the list of options, choose 'More', and then select 'Settings', then 'Privacy and Security'. Scroll down the resulting list and check or uncheck the 'Accept Cookies' item.

Android Chrome
Start Chrome, then open the options menu and scroll down to 'Settings', followed by 'Site setttings'. You can now choose whether to allow sites to save and read cookie data.

Windows Phone 10
In the Edge Browser, tap '...' then 'Settings'. Click on 'View advanced settings' then scroll down to the Cookies section, where you can select the required cookie behaviour.

Windows Phone 7/8
In Internet Explorer, tap 'More...' then 'Settings'. Check or clear the 'Allow cookies on my phone' item to set the required cookie behaviour.

Blackberry
Open the browser from the home screen, then press the Menu key, followed by 'Options'. Under 'Privacy & Security' you can choose whether or not to 'Accept Cookies'. Press the Menu key and select 'Save' to save your selection.