I tried the following link but could not change the guild name.
https://help.standingstonegames.com/...ld-Rename-FAQs

Log into the game on your guild leader character
Press Esc
Click Help
Click 'New Ticket'
Select 'Premium Services' and 'Guild Rename'

>Click 'New Ticket'
>Select 'Premium Services' and 'Guild Rename'
I could not find any of the above options.

Please let me know how to solve this problem.