Blocking is separate from reporting. Report a policy concern when appropriate, then block when you need to stop unwanted interaction.
Open the other user's Profile and use the profile actions menu. If Block is available, review the confirmation and complete it. The exact profile action can change, so do not use a similarly named action unless the screen identifies it as blocking.
To review or reverse a block, open Menu → Blocked Users and follow the current control shown for that account.
If the original Block action is unavailable or interaction continues after refreshing, use Menu → Contact Support. Blocking does not automatically submit a safety report.