How do you open a ugx zombie map and add weapons to the wall? If  someone can help can you Skype or kik me skype: realityondex or kik: trevor_hackney you can also leave a comment below please !!

Are you talking about a ugx mod map that someone else made? If so, then you cant edit other peoples maps, but if its a map you made, then just add them like the regular wall weapons, should be a folder in your prefabs containing them.

yeah I am trying to edit other peoples weapons

yeah I am trying to edit other peoples weapons

Well, it's not possible, sorry.