Oooh it can be maddening to get logged out.
What sort of thing are you writing? We have several very active writing groups - they tend to be divided up on genre such as Flash Fiction, Short Story, Childrens, Womans Fiction, etc, but also general ones such as Beginners, etc, and specialist ones for those preparing to submit to agents such as Synopsis & Outline group.
You can find the list by clicking on the orangey 'Groups' tab near the top of the page.
As a Trial Member you can join one group and upload one piece of work.
Good luck.
- NaomiM
<Added>Just to add, if you click on your 'My WriteWords' in the top right hand corner of the page, you'll see somewhere to click on to upload new work.