I'm taking over someone elses job and am using the computer he was using. In the App Store there are some apps that ask me to enter a password and have an Apple Id already filled in but won't let me change it.
For example there's an update to Evernote. In the Apple App store when I click on "update" it prompts me for the password and has the e-mail address of the previous employee automatically filled in (and I can't change it). What can I do? Evernote itself is signed out, so there definitely wouldn't be a loss if I reinstall it.