only in the context of mod b essays you can (since its a very personal response sorta module), but even so, ik some mod b markers don't like it cause they see it as informal, so I'd just say 'the audience' to play it safe
common mod and mod B for sure is ok, saying "us" or "we" referring to readers or audience is good cos a lot of questions ask for "your" response, but dont overdo it and saying "I" is a bit far