Very frustrating; this site keeps adding to it's rules and some of the software doesn't seem to work/keep up with the changes. The organizers/designers are really controlling. Also find the fees rather a lot if you don't use it so often - I had to pay another thirty pounds every time i wanted to make contact with other musicians.
I can understand they want to attract serious musicians, and may be "weed out" the more casual/amateurs. So if you're looking just to enjoy, experiment or feel your way into collaborative music, and don't have a 'business plan', this might not be for you. (I haven't found a site that suits me though...). If you have money and patience, it might be worth battling your way through all the rules - I did find a musical friend and it's been good.