SL6 x64 Intel Chip - installing & running Fritzing

Thanks, tried fixing sudoers file but could not find my user as an entry.
I suggested perhaps as I am learning this to reinstall SL6 paying attention to sudoes password.
My other passwords work , but sudo password is diffrent somehow..
Smiliken suggest: that sudo password and nick$ file is the same ===I have tried that it did not work.
I will also install kde desktop...it is an add on in SL6 -it uses GNOME I think (ok I will make sure they are on ..)
I will addpath to ./install_fritzing.sh to try your suggeston : must be in the path to be found.
Since I am new to Linux and SL6 distro I will try and re install SL6 as a last resort, I would like to resolve the problem as one learns from the expereince. Thank you for your hlep.