Ok, i cant seem to understand how to upload a custom level to voxatron's BBS.
I realy need someone to link me a tutorial

Here: https://www.lexaloffle.com/voxatron.php?page=submit

There is a image file in your roaming/Voxatron folder, upload that.

You need to go to Users/(you)/AppData/Roaming/Voxatron/my_levels and then open that.