Reauthorize ADE on computer with current email/password

I bought a tablet last week.  When I downloaded the Wilbor app for ebooks from my local library, I authenticated ADE with my current email and password.  When I downloaded the Wilbor app on my computer, ADE is authenticated with my old email and password so my downloads on my tablet are not visable on my computer.

With the help of Adobe Chat, I deauthenticated my ADE on the computer, but now I don't know how to reauthenticate it with my current email and password.  Please help!