No worries. You only have to join if you [a] want to ask a question or [b] if you want to join your Roll Call - this is a section where you can chat to others on your cruise, perhaps meet up for a drink, and share shore excursions. We have made some very good friends through our Roll Calls and are still in touch!
Another good section under the 'boards' bit is Ports of Call - find out what to do in port yourself and how to get around.
ps; this site is horribly addictive once you start reading.....
pps: this site is mostly updated by Americans who do tend to be into micro-planning with questions such as how many coat hangers are there in the wardrobe!!!