Creator of the software here. Sorry, I haven't had time to write up a tutorial. I intend to eventually, but even with a guide, using the tool isn't a great way to start learning how to make motors in my opinion. It is very useful for testing ideas once you understand the constraints that solid motors operate within, but it can't do much to help you learn those. If you have done some reading on making motors, the parameters it asks for should be familiar. Let me know if this isn't the case. As Nytrunner noted, there is a longer discussion about the software on the research section of this forum, which you have to request access to from a moderator.
i will do some more reading on Richard Nakka's site, specifically this part: http://www.nakka-rocketry.net/th_grain.html
i am not a math wizard, so would openmotor do all this math for me?
also, can openmotor do the same thing at guipep or propep?