Q. I would like to change the online account linked to my app membership.
You can link another online account to your app membership by cancelling your currently linked online account, and then connecting another online account.
You can unlink your current online account by clicking on My Account > Settings > Unlink the APP from your UNIQLO.com account > Unlink. You can then link another online account by following these instructions - Linking your new online account to your app membership.