Firstof – Lazydev did the mostest proper job to show how the upload is done via Youtube tutorial: check it out:
ultraquick steps
#1 Make a screenshot / cartimage with F7
#2 Make a quick gif video with F8 start F9 stop
#3 Save your game with „SAVE NAMEOFYOURGAME.p8.PNG“
#4 Login to Lexaloff BBS and upload your program