[Question] How to add an item to the mpq when u finish editing it

[VIEJO]

Well, I just joined into model editing today is my first day but i edited my item and all saved it converted back to a blp and now im stuck at how i save the file into the mpq ive tried using that pack way but i get an error report :\ Anyone know of an mpq unpacker / packer i can use like in GunZ the mrs unpacker?

Now i think i found out but when i try to replace the second weapon i want i get an error report.