I need HELP. Just found a snake on my back porch in Queensland Australia. It's green with a yellow belly.

Answers:
It could be a tree snake which is not dangerous, but on the other hand, it could be a green mamba, or some other time of highly venomous snakes! Dont go close now, we don't know!

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that sounds like the old green and yellow belly
eye of jealousy there
if i was you i would get rid of it as quickly as possible
may God bless you

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http://mdc.mo.gov/nathis/herpetol/snake/.

Info here about many snakes, including a yellow-bellied water snake (green).

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What do you need help with? Instructions on how to let it go on it's way?

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Looking at pictures of snakes in Australia, it looks like there are only 2 candidates for your snake and both are quite venemous
The Tiger Snake which is a land snake and the Yellow-bellied Sea Snake. Here are descriptions on the first link and pictures on the second.

Please be careful and stay away from it.

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its just a green tree snake not venomis and they are very scitish so if you go with in just a couple of meters of it it should run away

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sounds like a pope's tree viper. leave it alone and leave through the back door