Problem scenario
In a Jenkins job there is a "Source Code Management" section. You checked Git and entered credentials. You entered the same username twice (or more). Now you want to delete some of those users to be able to know which (unique) password is being used. What should you do?
Solution
It isn't always easy to find where the credentials for your Git repository are stored. There are different ways of finding them.
Possible solution #1
Go to the home page of Jenkins. Then go to "Credentials". (It is not Git-based. You can see this link for more information.)
Possible solution #2
Go to the home page of Jenkins. Go to another master. Then go to "Credentials".
Possible solution #3
Go to the home page of Jenkins. Go to a project folder (for the job of the credentials you want to change). Then go to "Credentials".
Possible solution #4
Go to the home page of Jenkins. Go to the job of the credentials that you want to change. Then go to "Credentials".