Your photo, being found in search, invitations, messages and blocked people, and why a switch sometimes has no effect.
Settings → Privacy. It covers what people who are not signed in can see about you, and who can get in touch. Change the switches you want, then press Save.
Show my photo publicly. Your photo can appear beside your name on the public page of an event you enter, and on your own profile page. Switch this off and your initials are shown there instead.
You add or change the photo itself on Settings → Profile.
List my profile in search. People can search for competitors by name at Find people. Turning this off keeps you out of those results.
It does not take your name off the events you enter. Your name still appears there, and your profile can still be opened by clicking it.
Let organizers invite me to their events. An organizer filling a card can search the directory and email you an invitation to enter their event. An invitation is only a message: it does not enter you into anything, and you would still register yourself.
Organizers find people through the same search as Find people, so if you are not listed in search, they cannot find you to invite you either.
Let other people message me. Anybody listed in the directory can send you a message on BoutHost. Switching this off stops new messages, including replies in conversations you already have. Your existing conversations stay in your inbox, and you can still write to other people.
Only people listed in search can be messaged, so if you switch that off, nobody can message you either.
If you have blocked anybody, they are listed here. Neither of you can message the other, and they cannot invite you to an event. They have not been told.
Press Unblock beside a name to remove the block. You block somebody from the menu at the top of a conversation.
This section only appears if you do not have a public profile yet. Profiles are made for people who enter an event or publish one, and Give me a public profile lets you ask for one now — which is what a coach would do.
Some of these switches cannot do anything for you yet, and when that is the case the screen tells you why, right under the switch. For example:
Your name, the weight you declare, your record and your gym are always shown on the public page of an event you enter, and on your profile. They are what an organizer matches bouts from, so there is no switch for them. The privacy policy, linked from the bottom of the page, has the full detail.