I had to the same problem but I found the answer!

Sadly we cannot use our myOs. This is because when the created the featur to make worlds they shut down registration for myO to try and get people to use the worlds. People who had an myO before this can still maintain theirs but new people cannot get one.

I know it sucks, I was really upset when I found that out :(

@fma17:

i have been trying scunce the 5th day i became a member.

i tired and tried like a week ago! i got pissed off, so i just stopped trying. but what i have heard adam is trying 2 make updates so that why it is probably not working.

eh, i dunno ]: people who didn't have a myO before Version Vibrant have trouble making and editing one

hmmm i don't know. mine is still the same from way back b4 theO updated so much.

I gave up making that thing. It's just too much of a head ache.