The name, ticker and image are written into the token itself and cannot be changed. Everything else on the coin page you can edit as the owner.
Open Edit page from Command Center, My coins. You can change the banner, bio (up to 1,200 characters), founder note, website, X, Telegram and Discord links, up to 5 tags, the Story text and the pinned post. Every edit is signed by your wallet. A signature is not a transaction and costs nothing.