Blue Adventure Question about Octopus quest

[Meomi]

I've been with an adventure with bloo for a few days now I kept looking at post seeing if I can find my answer but so far I haven't.. I am doing the

"Bloo wants to scare Eduardo by putting a fake octopus on his bed. It's up to you to build a giant octopus!"

and I can't seem to find the marker.. I also looked I think everywhere? but obviously not lol can anyone help? thanks!