Create ssh for github account:

• ssh-keygen -t rsa -b 4096 -C "account@example.com"

Add account into ~/.ssh/config

Clone repo

• git clone git@github-first:username/repository.git

Config github account:

• git config user.name "Your Name for Account"

• git config user.email "account@example.com"

Check git ssh configuration whether it matches to ssh key:

• echo $GIT_SSH_COMMAND

If needed, change repo to SSH URL:

git remote set-url origin git@github.com:xxx/xxxx.git