Hi almo
Here is the link to this week's (a particularly long one)
If you browse through you will see how it works, and also that it is an opportunity for some friendly chat as well. http://www.crosswordsolver.org/forum/329789/offset/273
Generally rambler sets it going - if he's not around, one of the other regulars does it. If I were you, the first time I would wait until someone else starts, then join in.