hi !
once u press the option post a new replay the window ll open then, then if u have u program already saved somewhere just copy it and past it here in the insert code , then press submit. for deleting u r post i thing admin didnt provide this option yes but u can still do it, on the rigth corner down near ur post u lll see a small bleu option edit press it so ur post ll open, then u can edit it by add to it or just press cancel so ur post ll be delet it :).