I can't use my Apple ID for the App Store on a shared computer
Hello,
I am using a shared iMac with High Sierra. I have my own Apple account and I can access my files on iCloud and my photos on Photos, but, when I open the App Store to update an app or buy a new one, it asks for the password of another user and I can't change the account since it is grey out.
Isn't it possible to use my own Apple ID on my own session in High Sierra?
Thank you in advance,
Andreu
iMac, macOS 10.13