1. If you have loose VPND tokens in your wallet, you can deposit them into your existing Node.
2. To deposit your VPND, just click on the three dots next to the Node you wish to compound, then click on Deposit.
Growing your Nodes by Depositing VPND from your wallet.
3. Your VPND would have been deposited into your chosen Node, growing it.
UPDATE: With the new roll out of claims tax, an auto compounding feature was added. This means when depositing into a node, the unclaimed rewards will no longer be lost if you forget to compound prior.