Purpose

If you'd like to log out of the account being used to access the Marketplace from within the Confluence Add-ons page and associate another account to the plugins being installed to your instance.

Solution

The credential is stored within a my.atlassian.com login cookie. You can do any of the items below:

1. Log out of my.atlassian.com
2. Access your Confluence instance with another browser that you have not logged into with your Atlassian ID
3. Clear the cookies out the from your browser

The next time you attempt to install an add-on via the UI you will be prompted to log in again with your Marketplace credentials.