If you normally get straight into AB, but you now find that you have to log in every time, it's likely that your browser isn't retaining cookies (or that the cookies are seen as out of date).
Start by checking that the date is set correctly on your computer. It will be shown at the bottom right of your screen or you might need to place your mouse cursor over the clock to see it. (If it's incorrect, right-click on the clock to access the option to adjust the date and time).
If the date's OK, next check that your browser is set to retain cookies and to remember passwords. We'll need to know which browser you're using (Internet Explorer? Edge? Firefox? Chrome? Safari? Dolphin? etc?) if you need precise instructions but, with many browsers, you start by clicking the 'hamburger' (three horizontal lines, top right) and then on 'Options'.