Settings -> !Gear Adviser
Make sure the Loot Suggestion Priority is set to your spec and that it’s at the top. Place the mouse cursor above the spec name so the green up/down arrow appear and move the spec to the top by clicking the green arrow. If the spec isn’t shown then add it from the drop down menu below.
Example:
Beast Mastery
Highest Vendor Price
Using it on a lowbie Hunter atm. with 1.070 