You don't. You don't need the autograph and you can't get the nine drachmas.
You end up not needing it.
To get the money to give to Hercules in Poptropica's Mythology Island, you need to complete tasks for characters around the island to earn drachmas. This includes helping the villagers, completing challenges, and collecting items to trade for money. Keep exploring and interacting with characters to gather enough drachmas to give to Hercules.
You can't
You don't need an autograph. After you get the five items, go to the Tree of Immortality, where Zeus will steal the items from you. Then Hercules will agree to help you. You will need the Touchscreen mirror from Aphrodite (on the beach in Poseidon's realm).
You can't earn 10 drachmas, only 1, so you never buy the Hercules autograph. You only get one coin, for cleaning graffiti off the outside wall of the Temple of Hades. You will use it much later to buy a windbag on Mount Olympus.
You don't need to get the 9 drachmas; he lowers the price and you have to do the other challenges first you must go to Olympus village where you must speak to Athena who will get Hercules to help you move the rock in front of Hades' throne room. :)
no you don't
The Greek Island. Everything that has to do with Greece is on the Greek Island, you know.
You can't get enough to buy anything from Hercules. You collect one drachma for cleaning the graffiti at the Temple of Hades, and you don't use it until you are headed for Mount Olympus, with the help of Hercules. It is used to buy a Wind Bag from Aeolus.
Hercules is Zeus's son and Athena's brother Hercules is who helps you in mythology island
You clean the graffiti off Hades palace and then this guy gives you drachamas
You don't. The only drachma on the island is the one earned for cleaning graffiti at the temple of Hades. It is used much later on the climb to Mount Olympus.*Except for talking to Hercules, nothing in Herc's Hero Hut has any function at all.