how can i use yahoo webhosting for more than one website (more than one domain name) ???

hi, i am a new webmaster ,,,, and i need to know how can i use one webhost ( yahoo 5 GB ) for more than one website ??
is this possible ??
i mean i have 5 domain names and i don't want to pay for 5 webhosting ..!!! so i just have a webhost for one of the domain names

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