Find the Contact in your Contact List, then tap their name to go the Checklist.
You should automatically go to the Checklist, but in case you don't, just tap the Checklist tab at the top of the screen.
You can see all of the Tasks for this Contact here, tap them to view more info, and mark them as complete as you work your way through them.
View past Tasks and Interactions.
You can also tap the "ACTIVITY" tab to see all of the Tasks you've completed for this Contact, as well as important notes, ER orders, and other helpful info.