Hi, Sophie, and welcome to WriteWords
As a full member you can join more than one group, or move around from group to group until you find one you're happy in. Some of the groups are a bit quiet, so it's best to join a more active one. Some of the most active groups fill up, so you might have to wait until there's space - in such cases contact the Group Host to say you're interested in joining, and they'll tell you if & when there's a space.
Chick-lit & Womans Fiction tend to be pretty active. Or you might prefer something a bit more 'general fiction' such as Novel Writers Group, or the spill-over group: Novel II....have a look around before making a decision.
In the meantime, you can always upload your work into the Archive.
If you have any questions feel free to ask.
- NaomiM