Answer: To use USDTEST, you need to invest it on the Gate.io platform. To do this, you can follow the steps outlined in the article at https://www.gate.io/article/27481. Once you have followed the steps outlined in the article, you can then invest your USDTEST on the Gate.io HODL platform at https://www.gate.io/hodl/182. Please note that USDTEST is non-tradeable and non-withdrawable, but you can still earn profit from investing it.
