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Cookies are small files which are stored on a user's computer. They are designed to hold a modest amount of data specific to a particular client and website, and can be accessed either by the web server or the client computer. This allows the server to deliver a page tailored to a particular user, or the page itself can contain some script which is aware of the data in the cookie and so is able to carry information from one visit to the website (or related site) to the next.
Instructions for enabling/disabling cookies for each common web browser can be found below.
Firefox: https://support.mozilla.org/en-US/kb/enable-and-disable-cookies-website-preferences
Google Chrome: https://support.google.com/accounts/answer/61416?hl=en
Microsoft Edge: https://support.microsoft.com/en-us/windows/microsoft-edge-browsing-data-and-privacy-bb8174ba-9d73-dcf2-9b4a-c582b4e640dd
Safari: https://support.apple.com/guide/safari/manage-cookies-and-website-data-sfri11471/mac
You can test your browser to see your cookies are enabled by going here: http://www.whatarecookies.com/cookietest.asp