The icon locates on top right corner of Stargate website where shows your wallet address.
You will see the STG amount in your account.
The amount of STG shown here represents all STG you have across all chains on Stargate.finance.
If you go to Transfer page, you will see your STG on each chain.
If you want to add STG to your wallet, you can switch your network to the desired network on MetaMask first and click “Add STG to your wallet”
Then click “Add Token” in the MetaMask Notification window.
Go to your “Assets” on MetaMask, then you will see your STG.
Repeat Step 2 and Step 3 until all STG is added to your account. You can go to the Walkthrough mode to verify the amount on each network.