Domain Mapping un sure how to map a domain

Not sure what I am doing ... lol
I want to map a domain to my multi site but im not keen enough to know what to do with pointers, subdirectories, or parking... not sure what to do...
Its set up like Fullenenterpries.com/site1 (where i would like to point my domain bryanfullen.com to the subdirectory, and it show byranfullen.com but i see no mapped domains in the plugin so i figured i need to go to c panel in ipage and point ...park... or add to subdirectory which do i do? thanks