SOMEONE HELP ASAP!?

I take computer science as a GCSE at school, and I am making the first three screens of my app on app inventor 2. Two of the screens require a list, one is the challenge a friend function, it requires me to provide a list of contacts of the user, so that the user can select one and send a default text to them to let them know they have been challenged to complete a puzzle. I don't need to know any of the blocks or coding for this, I just literally need to know how to use ListPicker, Listview, and the Contact picker, please help.



Here are the doc pages for what you're looking for:

Listpicker:
http://ai2.appinventor.mit.edu/reference/components/userinterface.html#ListPicker

ListView:
http://ai2.appinventor.mit.edu/reference/components/userinterface.html#ListView

Contact Picker:
http://ai2.appinventor.mit.edu/reference/components/social.html#ContactPicker

For the first two... You set the elements of the list picker in Before.Picking, and the action for what you want to do in AfterPicking.  If the ListPicker is NOT visible, the button won't show and you have to display the list programatically.  If it's set to visible (showing), a button will show on your design and runtime screen, which, when clicked, will show the ListPicker.