The address in StarkNet is different from the address in ETH ecosystem, the address Argent X created is deployed as smart contract, thus, you cannot control the address directly. Say your Metamask Address is 0xMeta…Maskand your Argent X deployed address is 0xArgentX…deployed. The way to get StarkNet Görli ETH is bridge ETH from Ethereum Georli TestNet to StarkNet Georli.
You can get Goerli ETH from many places. For example.
By Paradigm
By Alchemy
And so on.
Then your MetaMask wallet 0xMeta…Mask should have some GoETH.
https://goerli.starkgate.starknet.io/
L1 Goerli address: 0xMeta…mask
L2 Goerli address: 0xArgentX…deployed
Just bridge it!

And next step? /Happy testing.~~~
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