Here are the steps needed to deposit funds:
1. Tap on the Account Menu 
at the bottom right corner of your screen;
2. Select Deposit Funds;
3. Pick your Payment Method;
4. Enter the Amount;
5. Based on your payment method, follow the instructions and tap Next.
💻 If you are using the Web-based app:
1. Tap on your email address at the top-right corner of your screen;
2. Select "Deposit funds" at the bottom of the field which will appear;
3. Pick your Payment Method;
4. Enter the Amount;
5. Based on your payment method, follow the instructions and tap Next.
You will see a list of your previously-used payment methods in the Deposit funds section. This list is customizable - you can remove a method as a suggestion for a deposit, however, this will not remove it from your registered withdrawal options.