You can like the part of the profile that stands out to you most by tapping on the green heart on any of the 6 photos or 3 prompts and then confirming by tapping Send Like.
You also have the option to Add a comment (users who leave comments are 3x more likely to receive a response!)
To skip a profile in Discover tap the red X at the bottom center of the profile.
To permanently block/remove or report a profile in Discover tap the three dots at the top right of the profile and select remove or report, respectively.
In Likes You:
To match and begin chatting, tap the blue comment bubble above the navigation bar at the bottom of the profile. The match will disappear from Likes You, and appear in Matches.
To permanently block/remove a profile that Likes You, tap the red X. You will not be able to undo or re-match with profiles you X in Likes You.
Likes You mirrors the functionality of Discover. You must make a decision on a profile before you are able to see the next incoming like you received.