Liquidor
#1 Ask to join or imply a serious degree of interest. If they know you from the taster sessions, then it should be rather smooth as that was the general point of taster sessions.
#2 Seek out players to try to join your own sessions. On the outset, DM'ing seems hard but its rather easy. The only problem with DM'ing is discovering your own style.
Thanks for the advice. I have tried inquiring if any positions are open. In one case the Dm has disappeared... as in, she has not been seen at the society for around a month.
In the other case, the dm / players were all already running their own campaign, which unfortunately has no positions available...atm anyways.
And I would definitely not be ready to Dm ( Imo), literally having played 2 or 3 sessions XD
I might work on trying to gather people though, and try to find a willing DM...