It is held on by plastic sleeves that are wound on to threads protuding from the padding.
You can get a flat blade (paint scraper would do), wrap tape around the blade to protect the paint on the rollbar, and just insert between rollbar and padding and lever off (a bit at a time - taking turns between sides).
The slevees might stay in the holes, or might come out with the padding. No problem - just push them back in to the holes in the rollbar if necessary, and push the padding back on.
HOWEVER. You don't need to remove the padding at this point... Fixing the "bracket" to the padding would be no trouble at all when you get the parts. A lot easier than the other brackets on the rollbar!