If you have downloaded the Abralife app and created and activated a user account there, you can log in to the Abra Store with the same username and password.
Forgot your password? You can reset this in the app. See this article for help.
If you don't have the app, you can complete the purchase in ABra Store without being logged in. You will still receive the Abra customer discount. After the purchase has been completed, you will receive an email where you can create and verify your account, incl. setting password.