Hi there. To remove your PlayStation account from his profile, make sure you're logged in via the Xbox account credentials, then go to Settings > Accounts & Linking. You should be able to unlink the PlayStation account there and link the intended account. You probably want to log out of your PlayStation account and clear your browser's cache and cookies before linking a different account there to avoid it automatically linking your account again. Then you can return to the Cross Save page and finish. As for your Bungie profile, unfortunately if your PlayStation account was the only platform account linked to it, it's now orphaned and cannot be logged into currently. You would have to create a new Bungie profile.