Just doesnt work

I tried to design a simple shed and every time I tried to adjust the dimensions the length or width would move when I lifted my finger. It wouldnt let me adjust anything. I would hit the plus or minus sign to adjust the roof height for example and most of the times nothing would happen. Every once and a while if I keep taping the + or - sign it would change but only by one numeral for every 5or6 taps. Very frustrating. I cant understand why there isnt a section to just enter your info like length width, roof pitch, etc. I consider myself very computer savy. Work in photoshop etc all the time so its not user error. I want my money back!

Smilininma about Design Shed Garage 3D