I believe the 'tag' that you have in mind is like a keyword (maybe like a 'hashtag') that allows you to search for them. I've never assigned one or searched by one.
But I'm technologically impaired...
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.