Can't set AI actor general settings to a patrol point?

So I’m trying to make an AI based off a book I bought for Unreal Engine 4 (Blueprints Visual Scripting for Unreal Engine by Brenden Sewell). The book has me going into the AI’s details panel and selecting the default category (it doesn’t show up for me but I can find it when I open the selection property matrix). In the default tab of that I have a patrol point 1, patrol point 2, and current patrol point like the book says however whenever I try to set them equal to anything it resets back to none and I can’t set it.

example of what I mean:

Any help would be appreciated.