Video for to grant login access to A5 Apps support in Salesforce Classic: https://help.salesforce.com/apex/HTViewHelpDoc?id=granting_login_access.htm
If you are using Lightning Experience, follow these steps:
– Click on user pic icon in top right corner.
-Under your name, click on “Settings.”
-On Left side, you’ll see Personal Information and from that dropdown click on “Grant Account Login access.”
-Find A5 Apps support and update for however long you can give support login for.