It may help if you have a more detailed example, based on FK.

In the "Relationship Field", you get five nominations. These can be written in any of the following formats:

Solo: Natalie Lambert
You're nominating Natalie on her own.

Nick Knight/Natalie Lambert
You're nominating Nick/Nat as a couple, i.e. romantic and/or sexual.

Nick Knight & Lucien LaCroix
You're nominating Nick and LaCroix in a non-sexual (CotK) relationship.

Solo: Worldbuilding (Forever Knight)
You're nominating worldbuilding, specifically in FK.

In each case, you'll specify further details in your prompts, if you go on to request the tag when you sign up.