Single post in Site Skins: How-To, and Helpful CSS

Hey, I know this post is several days old, but can I get some help with this? What's the code for removing About Mes ONLY on multiuser profiles? This has been a problem for me for 243685704 years because multiuser About Mes make my mobile lag to the point of being nearly nonfunctional but I'm the literal worst at coding and can't figure it out ^^;;

#multiuser #aboutbox, #multiuser #trainercard{ display:none; }