Thanks! I did actually find a tutorial and did adjust the blade and it's MUCH better- however, now that it's cutting correctly the vinyl is shifting and ends up cutting the last part of it off of the vinyl. The roller bars are locked down in place- I am using 15 inch vinyl (the color I'm using, I can only get locally in 15 inch)- thinking that has something to do with it- but Sign Warehouse assured me that this cutter would do fine with 15 inch vinyl....
Is there a trick to make it not slide around and shift out of place?