How to change a guild name?

[Epideme-chamber-of-aspects (Epideme)]

They are temporarily disabled according to this

Guild Services Unavailable

Guild Services indeed exist, Poisonenvy! But I’m afraid they’ve been temporarily stopped. We do not have an ETA for when they will come back, but we will be sure to let you folks know once they do. You have more information here.

Guild Services - Blizzard Support (battle.net)