Creating a token in testnet v2 (XLS 20)

I tried to create my own token to test with the NFT web app that we are building. But every time I go to token creator app, it throws

You opened the xApp with an account you don't have full access to. (Read only)
 
Please close this xApp, navigate to the home screen and switch to the account you want to issue your token from. (Needs to have 'Full Access') Then open the xApp again.

But the account was seeded from "https://hooks-testnet-v2.xrpl-labs.com/" with Full Access. So I am having a hard time to add and test the custom tokens.

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