Editing drop-in visits?

When I get a request for a drop-in visit, how do I edit certain aspects? For example: If I am needed for just one visit one day (evening) and then 2 visits the next (morning and evening), how do I set that up on Rover? It only lets me choose 1 or 2 visits per day when each day needs to be a different number. So 3 visits in 2 days... how do I do that?