Can I create a user group?

Yes, but you need to be a Site Admin to create user groups.

To create a user group:
  1. Click Admin in the SourceForge toolbar.
  2. On the Site Administration page, click Groups.
  3. Under Groups, click the group to which you want to add the user.
  4. On the Edit Group page, click Add.
  5. Use the picker to move users into the group, and click OK.
  6. Click Return.

If you are not a Site Admin, contact your site administrator to create user groups.