I need help modifying the AB's on my typhoon!

Hi all, Never tried and of this modelling before so if you could tell me what programmes I need and where I can get them from I would be gratefull!
The AB's On my Typhoon are square and I wouldnt mind them being round as it doesnt look too good!
Heres a pic>>>

Hope you can help.
Sam
The AB's On my Typhoon are square and I wouldnt mind them being round as it doesnt look too good!
Heres a pic>>>

Hope you can help.
Sam
