On the android app at least, the only way to change the order of pots is to delete and recreate them. With the recent addition of locked pots which cannot be deleted before a set date, this means that pots cannot easily be rearranged.
Having recently reorganised how I use my pots (weekly spending, savings for events, general savings), it would be much more convenient to be able to shift my weekly spending pots to the top, and the savings pots down.