Push Command Error

How do I remove the following Push Commend, Error Messages:

AzureAD+AdminUser@Surface MINGW64 /g/google/panel (master)
$ git commit -m “doc commit batch” .
fatal: Unable to create ‘G:/google/panel/.git/index.lock’: File exists.

Another git process seems to be running in this repository, e.g.
an editor opened by ‘git commit’. Please make sure all processes
are terminated then try again. If it still fails, a git process
may have crashed in this repository earlier:
remove the file manually to continue.

AzureAD+AdminUser@Surface MINGW64 /g/google/panel (master)
$ git remote add origin git@github.com:CforED/sway.git
fatal: remote origin already exists.

AzureAD+AdminUser@Surface MINGW64 /g/google/panel (master)
$ git push -u origin master
Enter passphrase for key ‘/c/Users/AdminUser/.ssh/id_rsa’:
To github.com:CforED/sway.git
! [rejected] master -> master (fetch first)
error: failed to push some refs to ‘git@github.com:CforED/sway.git’
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., ‘git pull …’) before pushing again.
hint: See the ‘Note about fast-forwards’ in ‘git push --help’ for details.