'Permission denied when I want to push something to my remote git

update: I added a ssh connection , now I can push to all 3 repos xD Thank you guys!

I want to push data to my other git account.

origin = remote address

But it displays me, that my other user account has no permission. What does this user has to to with my other account xD

Am I somehow logged in?

Why can I push it to my third account without any problem?

$ git push origin master
remote: Permission to myshareplace/synth.git denied to xxx.
fatal: unable to access 'https://github.com/xxx/xxx.git/': The requested URL returned error: 403


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