From here follow steps 4-7 found at this link in order to setup SSH agent and add your key to your SSH agent's keyring. You do not need to generate new SSH keys, skip the ssh-keygen steps!
First, download your SSH keys from your Google Drive to your "Downloads" folder.
Find your terminal application and open up a new shell:
macOS: ⌘ + space, then search "terminal"
Ubuntu: ctrl + alt + t
Run the following command to make sure that you create a directory called .ssh:
mkdir ~/.ssh
Move your SSH keys from the "Downloads" folder to the ".ssh" folder using the following commands:
In order for you to add these files to your keyring in the next step, run the following command to update the file permissions of the keys:
chmod 600 ~/.ssh/ed25519
From here follow steps 3-4 found at this link in order to enable SSH agent and add your key to your SSH agent's keyring. You do not need to generate new SSH keys, skip the ssh-keygen steps!