How to make a Puzzle Speedrun

Yesterday I saw a streamer and Lichess user called TheLlamaLord to do a Puzzle speedrun here in Lichess. I ask how can I make a Puzzle speedrun to play? I dont know how to configurate Lichess. Thanks
You can saw what I talking about in his video near the end
https://www.twitch.tv/videos/244820133

Id like to know too @thellamalord

Here is a picture of what I talking about (yellow =I remove is face to protect is identity)

https://i.imgur.com/qiJeyBK.jpg

Like we dont know what LLamaLords big schnoz looks like

Any one have an answer?

i'll only tell you if you take back the big schnoz comment i've never been more offended in my life

Ha, that puzzle speedrun is pretty great.

There isn't a way to reset a person's puzzle rating... I'm unsure what to suggest (for everyone)... maybe race http://blitztactics.com/ ? But they don't have as many puzzles as other sites. :-(

@TheLlamaLord I have a bigger schnoz, so on behalf of that other dude, I take back his statement.

Did you actually just sandbag your tactics rating so that you could start from 1200? Or is there a faster way to do it?

That looks cool, I too, am curious