У вашего броузера проблема в совместимости с HTML5
Don't know why Discord made their log out hidden took me a while my first time using it to find it.
In case video wasn't easy enough to follow here are the steps:
1) Go to User Settings (Cog in the bottom left corner)
2) You will get a pop-up window in that window you will have a grey/black section labeled user setting now at the way bottom in the white area there will be an arrow [Click it]
3) When clicking the Arrow button it will open up the Log Out Button. [Click that[
Congratz you just logged out. Hammer & Chisel should make the log out a bit easier.
Hoped this video helped!