Wishhh.com is pretty straight forward. Click on the subjects down the right side of the the site tour pages to get explanations on how everything works. Most everything you need to know is explained there.
Of course, you can also ask other members of your group for help. If someone else is the administrator of your group (ie: they setup your group and invited you to wishhh.com) please contact that person for assistance.
But if all else fails and you still need help, I can be contacted at firstname.lastname@example.org. I apologize in advance if I don't get back to you right away. I'll do my best.