Crossing ETH to JustLend is possible, but it is not supported by most exchanges. The best way to do this is to use Poloniex, an exchange that supports ETH-TRC20 conversion. On Poloniex, you can convert your ETH to TRC20 tokens, which can then be used to trade on JustLend. To do this, you will need to open an account on Poloniex and deposit your ETH into the exchange. Once you have done this, you can go to the TRC20 trading page and convert your ETH to the TRC20 tokens you need. Finally, you can send the TRC20 tokens to your JustLend wallet, where you can use them to trade.