You can change the order your FAQs are sorted in when your users view by author, category or tag via Settings --> FAQs --> General.
If you want to be able to set an absolute order the way to do this is to set the date sort option, then in the individual FAQ configure tab use the display date to determine an order. The FAQ with the most recent date will be shown first in an author, category or tag listing. The FAQ with the second most recent date will be shown second and so on.
Note that if you set the display date to invisible either globally in Settings or individually on an FAQ's configure tab the date won't show on the front end to your customers/users but the date you set will still be relevant in determining the order in which the FAQs displays.
See the video below for a walkthrough