Three times a game at night, you may target a player. Assuming no interference with your action you will heal your target from a singular killing action that successfully targeted them.
You know you had a role, but you forgot what it was. Upon the game starting, you'll receive a role PM indicating that you forgot what your role was (that is to say your role will be hidden). After night 3, you will remember what your ability was and you'll gain knowledge to the full ability of your role. You may still elect to use any abilities you have access to before you regain your memory though you won't know what they do. Should your role be one that gets results, you will still receive correct results that you normally would've gotten (barring another role interfering of course).
In order to submit an night action while your memory is lost, you should format it as follows for the most inclusivity: I target this player with my night action. Should you try to guess what your ability is and are wrong, your action will fail (e.g if you say try to use a doctor ability on your target when you lack access to that ability, your submission will be considered invalid and you will commit no action). Same idea goes for submitting a day action while your memory is lost*.
*Should a player have access to an amnesiac day ability, the mod should allow said player to submit said action in the following format: