League of Legends (LoL) Question: Created a guide, can't edit it

Hello,

I'm not sure if I'm asking in the right place, but I created a guide and it's listed under a Guest account, inhibiting me from editing it. The guide is here (https://www.mobafire.com/league-of-legends/build/ultimate-guide-to-sion-jungle-603198).

I looked up the issue and apparently it can get assigned to my account - where would I request that, if not here? Thank you in advance.