SSH keys are usually stored in hidden ssh directory on MAC. (If you know where the keys are stored on Windows please add it to the comment. Cheers).
It might sound complicated but it is actually very simple. You only need to generate the key using phrase to encode the content, give it a name and add the key, which means letting ssh that the key exist. If you have generated the key for git you will need to open the public version of the key and copy the content and paste it into the git. That way git can authorize all your actions without asking your for password. After you do all this, you should be able to pull and push code from and into the git repository.
cd ~/.ssh ssh-keygen -t rsa // enter the key name then enter the phrase which is used to code the key // once the code is generated add it ssh-add mysshkey // if you are generating ssh key for GIT you need to now copy the content of the your public ssh key // lets say you called your key git, open the git.pub file and copy the content vi git.pub // now you will need to paste the code into your GIT settings in your profile // you can now check if everything is ok, you should get welcome message from GIT server ssh git@github.com
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[...] Now you should be able to generated and “add” the SSH key. If you are not sure how, check my article about generating SSH keys. [...]