please fix the block man so i can put my own skin
I have moved this into the bug reports sub-category.
Now you just have to wait and hope that the bug gets fixed 
Also, welcome to the PixelTail community forums. Enjoy your stay.
The blockman skin is broken because you can change your minecraft name now
It’s a shame that it’s no longer working, but @macdguy isn’t the original creator of the add-on.
Whilst he could probably fix it himself, he and the rest of PixelTail are very busy developing Tower Unite, and GMTower is going to be closing sometime next year.
Your best bet would be to get in contact with the person who created the add-on, they can try to fix it, and thus fix it for every server using it.