This is my first game jam, and as of right now, I only know how to use Scratch. No I do not know how to use anything else.
yeah i have a website that can convert sb3 to html
https://sheeptester.github.io/words-go-here/htmlifier/
so you can upload a html file
https://junebeetle.github.io/converter/ It took my a while to find it, but here you go!!
also, did you know that you can just make the game in scratch3 then convert it to a scratch2 file? https://github.com/RexScratch/sb3tosb2