You have to remove the belt clip, then the battery cover. There is a locking tab at the top of the belt clip.
To remove the belt clip, press the LOCK TAB down , then gently pull the belt clip up toward the top of the radio.Then remove the battery cover, press near the seam and slide the cover down:
Replace the batteries, observing polarity.Slide the cover back on until it locks in place.To install the belt clip, slide the clip down into the slot on the backof the radio until the belt clip lock clicks. Hope this helps! If you need more help, please ask!