Four words—not very helpful. How? Where?
Another option is to see if you can get a free template to your specs at:
Old thread, question well answered, but —
When I've done pieces for hand/home production (such as community organization flyers, where volunteers might print and fold 20 or 50 for their own needs), I've found it useful to put tiny fold marks within the printing area. That is, the smallest, almost-invisible tick perhaps 0.33pt, 0.1 inch long, right at the left or right edge and blended into the design. It can speed up hand-folding, especially trifold, by a lot to include that first precise fold mark. All the volunteer has to do is line up the first fold corner on the mark, flatten, and then make any second fold to match.