this has to rate as the worst advice thread on STW ever.
far more incorrect information than correct, is that down to being desperate to post something so not reading the OP or looking at the picture?
that is removeable by destruction, however its not quick n easy. if you dont have the right tool, i suspect you dont have particularly suitable tools for destruction either.
find an lbs or friendly local bike mechanic – or accept this is a job for another day, read up on the parts you are dealing with via sheldonbrown.
edit: at this time on a sunday, halfords might be worth a call, likely to have the tool and will remove that for a pack of biscuits.