The key points you want to get across are:
Privacy and confidentiality. Only admins have access to email addresses, you can choose a username that does not reveal your real name and likewise with any avatar/photo. You don’t even need to reveal which country you are from (again IP addresses are admin only)
No judgement. Your community is a safe space where you do not need to defend your usage or needs.
Just say “hi”, you don’t need to write a bio. Just drop in say hello.