I am new to using this CMS and I am having problem installing as I am not the fields as per instructions.
I can see the form tab but i click on the tab I do not see the from as per http://www.silverstripe.org/user-forms-module/
You would not see a form just like you see on the picture in the link you provided. You have to add fields to the blank form to make it look like that.
1. Right on top of the tab (just below the tab name - form) you should see a small band of grey color saying Add: Text CheckBox etc
2. Click on any one item to add that to the form.
3. Add, delete elements as you please to make sure it looks like the form you want shown on the site.
Hope this helps, if I am totally wrong in understanding your problem, pardon me.