You can choose to use either the present or past tense, and can write with either a first person or third person perspective depending on your personal preferences.
However you should try to maintain tense consistency throughout your writing.
Excessive use of Out Of Character comments in any other room where role playing is taking place is against the rules, and can result in administrative action.
There are two basic ways that your character can interact with others in a chat room.
This allows you to enter and get a feel for the action and conversation, while you wait for your official profile to be approved by the Administrative staff.
Descriptions of the environment can be found by hovering over the room name in the list.