I have a galaxy dx33hml with 120 channels im trying to tune it to regular channels how should i do this

The hml has not been in production since 2006. If you Love that specific radio the first thing I suggest before attempting to tune or mod replace all the capacitors they may have leaked or dried up especially if left uncovered for a long period. But I would not bother when the galaxy 33hp2 updated the model with dual finals for under a couple hundred dollar. The radio is easily converted with info you could gain from here or a cb forum.