These keys can push to and pull from every repository you have access to. Remove any key you no longer recognise.
{% if keys.is_empty() %}Add a key below to start pushing over SSH.
{{ k.fingerprint }}
Generate a key if you don't have one, then paste the contents of the .pub file above:
ssh-keygen -t ed25519 -C "you@example.com" cat ~/.ssh/id_ed25519.pub
Once added, check that the server accepts it: