It is indeed possible to lend on the JustLend platform. To do so, you will need to create a TRON wallet and deposit TRX into it. Once you have done that, you can freeze your TRX to get bandwidth or energy and vote for your favorite SRs to receive TRX rewards on a daily basis. After that, you can supply and earn on JustLend.org.
For more detailed instructions on how to get started, you can take a look at the Quick Start guide provided in the existing answer, as well as the In-depth guide and Youtube Tutorial for a more comprehensive understanding. Additionally, be sure to follow the Golden Rule mentioned in the existing answer and never PM admins or mods first.