You need to get surf from the safari zon then surf down from pallet town
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meet blue, the gymleader on cinnabar island
go to pallet town and surf down. Soon you will reach cinnabar island, which the gym leader is Blaine, who uses fire types
Go to pallet town, go south were the water is in Pokemon red and blue, and use surf then keep going till you get there. :)
The magmorizer is on Cinnabar Island. You must defeat Blue first before being able to get to the top. Professor Oak will give you HM Rock Climb to get up to the top of Cinnabar, where somewhere on that island is the magmorizer.
Go to Cinnabar island and talk to Blue. He'll agree to go back to his gym and battle you.