For macros in the macro bar (at the bottom of the screen), you can drag them to reorder them (a small grey handle appears on the side of the button when you hover over it). For abilities in the token action bar (at the top of the screen when you have a token selected), the buttons are ordered the same way they are ordered on the Attributes & Abilities tab (you can drag to reorder them on the A&A tab). Roll buttons from a character sheet set as token actions and macros set as token actions can't really be reordered, and screw up ordering of abilities as token actions. (For this reason, many character sheet authors have eschewed the token action feature.)