Sorry. "Friend / Story Supports" are distinct from "Support Servants." It's a little confusing.
In general, I suggest defaulting "Support" to talking about a unit's role and just thinking of a Friend or Story unit as a "borrowed" unit.
Don't worry about setting up your own "borrow" list for now -- you only get a tiny amount of FP for people using your units. At high levels, it's mostly done just as a mutually beneficial arrangement; the FP don't matter, but enticing people with strong Servants to borrow their own strong Servants is a boon. For now, you have us, and we should have you covered.