The Product List page refrences all the proucts in your store, the instructions below are to change the order.

1) In the Store admin on the left side click Products

2) click button labeled “all”

3) Click link "Show order"

4) Number each accordingly. 1 will move the item to the top of the list and no, you don't have to sit numbering all your products just the ones you wish to rearrange.

5) click "Update" when finished