There is no access to the turnip, how to reconfigure the project to a new one?

Question

git

Guys help!
I took over a small farm here, there is a web project with which I need to actively work, but there is no access to the turnip on the bitbucket (the password has been changed, where is the person).
I want to transfer the project to my rap on bitbucket, and take the source code on the server as a basis. Yes, I've never done this.
How can I do this, on the server?
Put your rep in /.git/config and do a git push ? Or does this not work and should it be done differently, in teams?