To sort your channels you can do it as auto sort or you can sort manually.
To auto sort, go to Settings/Appearance/TV Guide and chose Channel Sorting. You will find some options on how to sort the channels, just chose the one you want.
To manual sort, when the channel guide, long press select on any channel, a menu will pop up in the right, scroll down to Reorder Channels, then you can move the channels to any other you prefer.