How do I know what trust level I am?

I think maybe the best way is to see which “Trust Level” badge you have. On your profile you can see a link to your current badges. e.g. I this is my badges page - Profile - brahn - ClarionHub
The options are
0 - Not logged in
1 - Basic
2 - Member
3 - Regular
4 - Leader

You can read more about Trust Levels here