League of Legends (LoL) Question: how to delete a guide?

There is no real way of completly deleting the guides you have made, at least on your own. The best thing you can do is archive it. That's the closest thing of removing you will get and I mean nobody will see your archived guides in the guide lists so you can consider it deleted.

OK, so archive your guide that you want to delete first. After you archived it, click on the guide again. You will see three buttons there. And click "Delete" to get the job done.

:)

Go to your guide, archive it.
And check your archived guide and you might see the 'delete' button near the 'view revision' buttons there I think so

Thats how I delete my lv 10 xin zhao guide from 3 yrs ago anyways :>