In Discover or Search mode, tap the star button to "Super Swipe" a potential match. When you Super Swipe on a profile, you'll appear at the top of their daily batch and they will know you want to meet them (your profile will be shown with a star on it). They will also receive a notification by email if they're enabled.
Free users get 1 Super Swipe every day. Shapr Pro subscribers enjoy 5 Super Swipes each day.