Bootstrapping User fields

[Kathorus]

So, I am messing with the Skeleton files. I made a Class component and some class things. In one specific class thing I wanted to bootstrap an ability that I made and would like the user to be able to input a custom value.

I have the field listed in the Class component and I am getting an error based on the rule that fields of type user cannot be used with unique things, since the assigned value could overwrite an existing user-modified value.

I can't find how to do what I would like, the wiki says you can use user fields, just obviously not how I am using it. Where would I put this field so I don't violate the 'unique thing' rule?