STEP 1

When you are on the seating map, select "Seat Selection" by clicking the drop-down arrow in the right-hand corner.
Select "Free Select."

This will allow you to select your seats instead of them being automatically selected for you.

You can choose each seat separately from this point on.

 

 
If you wish to select a group of seats

Slide the cursor to the top-left corner, click the drop-down arrow, and then choose the rectangular box.

By dragging the cursor over the set of seats you wish to choose, this will select every seat that is highlighted.