Hi, I started speedrun Donkey Kong on Intellivison and I don’t find where to post my run and time. Can someone create the category

I'd suggest you ask one of the mods directly or ask on the game forum. You're much more likely to get a reply than posting in the general forums.

The said game doesn't exist on the site, so you may request it here:

https://www.speedrun.com/requestgame

(make sure to read everything there)