Change Shape

[Sturmrider]

Creating an NPC that has change shape. Now when I click on the tool it comes up with the change shape dialog box.

The Abilities Retained is very simple with checkboxes. The Abilities Gained though is confusing. It comes up with for example +2 to one Ability Score. I click on it and then double click thinking it will tell me what abilities I can adjust nothing happens.

When I click on the question mark it says: +2 to one ability score (Choose)

Unfortunately there is nothing to choose there. Is this just an adjustment you make in play or is there supposed to be a box that comes up for me to choose.

Thank you again for your help.