The CHARMM forum, http://www.charmm.org/ubbthreads/, offers access to questions and answers to a wide variety of CHARMM related use and other issues. Please join the forum and use it as a resource to answer your questions; please check to previously posted questions before sending yours. It will save us a lot of time!
Additional sites to access CHARMM documentation and other information:
Access CHARMM-GUI to generate structures and prepare inputs for CHARMM calculations.