When editing your guide, you should see this at the top:

The text I highlighted with the red border is probably what you missed: just click any of the 10 empty slots above it to add a build (which includes setting up runes, masteries, items etc.)
I'm not sure what you mean exactly with your second question, on which page do you run into a 404 error? Are you not able to simply view your guide in your Content Library and work on it from there?

The text I highlighted with the red border is probably what you missed: just click any of the 10 empty slots above it to add a build (which includes setting up runes, masteries, items etc.)
I'm not sure what you mean exactly with your second question, on which page do you run into a 404 error? Are you not able to simply view your guide in your Content Library and work on it from there?
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do i have to save the build apart from chapters in a way i dont know ? help plz ;c
guide : http://www.mobafire.com/league-of-legends/build/ad-varus-mid-guide-for-high-elo-plat-1-patch-5-14-427506
also i accidentally (kappa) pressed archive on a recent update and i cant find it now to un-archive it. the primary update (link) is not archived. also after i did that i cant update my guide anymore. so what can i do to keep updating it ? because when i try to update it i get this problem : http://prntscr.com/7vmb6z
the same pops up when i try to vew my last updates (afer i archived) from my profile