Hi! 
OK… I started my toon as Demonology (build?) Then I got a quest to get the Scepter of Sargeras for Destruction . They offered to let me change to Destruction, so I did. I was thinking it was just to do that quest… Maybe it was?? Well, I got the campaign done, and got the scepter. Now I can’t change back to Demonology… I thought we could do that in any main Town… I can’t seem to change back. Could someone please tell me how to change back? ( I didn’t start the quest for Affliction weapon.) It seems to me, the NPC should offer the change… 
Much Thanks!
Peace… Faith
I think you should open an in-game ticket and ask this question to the GM. My guess is that this is an in-game bug.
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If you’re trying to change back with the Destro weapon equipped try removing it first.
I seem to remember that being “a thing” in Legion.
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Just wanted to say, MUCH Thanks Occultsoul and Aedred for taking the time to reply… Currently, I can’t get online Aedred to see if your suggestion would do the trick… Occultsoul, the online help wouldn’t load up with the HELP when I tried t hat…
As I said, now I can’t get into the game since I’m getting the BLZBNTBTS0000005C error: "We’re having trouble launching the battle.net Update Agent. So, guess will go and post about this in another forum… 
Ta Ta!! 
Have a great day!
Peace… Faith
to change specs
PRESS N , u will see the 3 specs choose demonology and change to it
be sure to be on town , some cities have zones that u arent resting