P.S. I didn't download rpms from amule site but from rpm.pbone.net. They should work, shouldn't they?
No idea - try one of the rpms provided by amule and it should work as expected.
You could try to discover where
your rpm places it's files by listing its content. Use rpm -ql aMule to see what's in the package and look out for the amule binary.
Anyway - that package can't be supported directly, because noone here built it. That doesn't mean we wont help, it just means noone knows how that pbone rpm has been built. Just try one of the amule rpms from this site instead.