Screen mode players have access to a variety of gestures and emotes via the quick comms menu. On PC these can be accessed by pressing the corresponding 1, 2 ,3 or 4 keys. On Ps4 they can be selected by using the D-Pad.
The point gesture can be used to access another player's profile. To do this, press the point gesture key (1 on PC, up on the D-pad on ps4) and then point at another player, you will then receive a prompt to see their Info, pressing the key will open up their profile.
From here you can explore their profile, you can also use this to quickly cheers or report another player.
The emotes category has 4 separate emotes for all those emotional moments:
Happy - Let your friends know how happy you are with this emote!
Sad - Nawwww, Don't cry! unless you want to, in which case use this emote!
Laugh - Perfect for a little giggle!
Angry - Grrrrr! The perfect grumpy emote for when you just can't score that basket in the Rec Center