[@casiepa Moderator 8 years, 9 months ago]

From your backend, go to Forums > All Forums, and edit the forum you want to move.
In the ‘Forum attributes’ box at the right, add a number different from 0 next to ‘order’.
There you can defined the order of the forums.

If you have done that and the order is not respected, then try with a standard theme and check again to make sure it’s not your theme that is not respecting the order.