I think that Boinky ACTUALLY meant that to delete a comic of one's own, one needs be a "Doner" or (explained) one sends money in not necessarily substantial quantity to BRAD via paypal or other means, whereupon one becomes a MEMBER thereby assuming the PRIVELEGES OF MEMBERSHIP, one of which is the ability to EDIT or DELETE toons.
Boinky is rude, crude and socially unacceptable, but is an excellent bed partner with a tounge like a giraffe and a passionate embrace that melts all your troubles away if the hallitosis doesn't kill you on the spot.
The "FAQ" to which he so crudely refers is the Frequently Asked Questions section which, cleverly, Brad has devised to answer many repeatitive questions such as the one you posed.
Of course his answer was more succinct than mine, but succinctness is in fact, a Boinky speciality.
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"I intend to live forever -- so far, so good."