need help deleting a sparse bundle from time capsule

hi

i use my time capsule to do regular backups of a mac pro and a macbook air using time machine. i would like to delete the sparse bundle for the macbook air and start again, but preserve the sparse bundle for the mac pro. when i try to delete the sparse bundle for the macbook air though i get the error message 'the operation cannot be completed because you do not have sufficient privileges for some of the items'.

i wonder if anyone could let me know what i need to do to delete the sparse bundle?

thanks

nick