To check a guest in using the TablelistPro mobile app, open the app, click the name of the reservation you want to check in, then click the Check In button.
Once there, select the number of guests (female vs. male vs. unisex) to check in and/or click Check In All. You do not have to check all guests of a party in at once (i.e. if part of the group arrives later than the rest).
Your reservation will now be checked in.