I was given an Evolution Programmer (nice gift huh?) Problem- I'm too stupid to know how to custom program the unit

. My truck: F250 SuperDuty 7.3L Diesel Quadcab/ 3 " lift and 315 tires. Looking primarily for gas mileage right now. If I tow, it is a fishing boat (boat n trailer 1200lbs). Preset tuning is for stock, Tow, Race, and Extreme. Other options: Rev. Limiter, Timing, Wide open throttle shifting, and standard shifting. Also, I am supposed to be able to enter the tire size, but haven't figured that out either

. Yes, I am new to this. PLEASE HELP!!!