If you're a member of the group, add your photo to the group pool. (If not, join the group, because only group members can contribute to the group pool.)

You can join the group by going to www.flickr.com/groups/wact/ and clicking on the "Join This Group" below and to the right of the "Wey & Arun Canal Trust" heading.

The easiest way to add a photo to a group is to go to your photo's page and click the "Add to a Group" link in the actions menu. Then choose the group you want to add it to (The group name is "wact"), and you're done!

Only you and the group administrators can remove a photo from a group pool.