Hi Abbie Sherman,
I just wanted to add additional information to my response above. You have to also modify the setting in Step 9 of 10: Access to Customize Screens on that wizard.
In this section, you have to put a check in the checkbox for This user is allowed to create new screens. In addition to that setting, you can also limit whether the user can customize all existing screens or certain ones from your dropdown selection.
I hope that this helps.
Ronen