When you sign up on PlotX using an email, a service called Magic Link creates a new Ethreum wallet for you (more details here). This wallet is meant to be used only on PlotX, so you can think of it as your non-custodial PlotX account.
Since it is newly created wallet, it doesn't have any funds in it yet (just like any other wallet), and hence, you need to deposit some funds in it from another wallet to start predicting on PlotX.
Here's a step-by-step guide on how to deposit funds in your Magic Link wallet:
Step 0 - Login on the app using your email and go to the Deposit Funds page
A guide on how to log in using your email can be found here.
Fees = Connext fees (calculated at the time of deposit) + Gas fees to be paid on Ethereum
Choose the deposit method you're most comfortable with.
For deposits from Polygon, there is only one method of deposit, i.e., Standard Deposit, which is selected by default and takes below 2 minutes to be completed.
Step 4 - Enter Deposit Amount
Enter the amount you want to deposit in your Magic Link wallet and hit the Deposit button.
Step 5 - Approve the deposit transaction(s)
Depositing from Polygon - If you're depositing funds from Polygon, then all you need to do is sign the initiated transaction in your wallet, and the PlotX protocol will pay the required gas fees on your behalf.
Depositing from Ethereum - If you're depositing funds from Ethereum, then you'll need to pay gas fees for the deposit transaction(s) on Ethereum from the wallet you connected with the Deposit Funds page in step 1.
For first time deposits, users will have to make a one-time approval transaction, before moving on to the deposit transaction.