I've git config like this:
[remote "origin"]
   url = git@bitbucket.org:archie/learn-express.git
   fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
   remote = origin     <==== 
   merge = refs/heads/master
[remote "znotanto"]
   url = https://archie@bitbucket.org/znotanto/learn-express.git
   fetch = +refs/heads/*:refs/remotes/znotanto/*
I wanna change the part that I show with arrow to znotanto. I've tried git branch master --set-upstream-to znotanto/master from so but give me error 
error: the requested upstream branch 'znotanto/master' does not exist
 
    