deauthorization of pc account

Hello everybody.

I face a problem with my pc

When I open the Adobe digital Editions app, I can't se my books that I can see on my phone.

Chacking my details, I found out that the app in my pc is authorized to another email of mine. (yahoo)

I tried to deauthorize it but the app asks for my password. I dont know that password, so I cannot deauthorize it. Checking with the adobe helpdesk the clerk told me that he can't see the yahoo email, only the gmail (which is the correct) .
Any ideas on how to deauthorize and re authorize with the proper mail, so that I can see all my books on my phone and pc?