Auto Import
Import everything automatically by clicking the following Buttons:
Manual Import Polygon
By default MetaMask uses the Ethereum Mainnet, but since PRPS/DUBI are on Polygon we need to switch the Network first:
Go to your MetaMask Settings ⇒ Networks ⇒ add Network ⇒ copy-paste:
Polygon Mainnet
https://polygon-rpc.com/
137
MATIC
ttps://polygonscan.com/
(Source: docs.polygon.technology)

If you did everything correct, you should see MATIC instead of Ethereum as your main Token now.
Manual Import USDC, PRPS & DUBI
Time to import the Tokens ⇒ Go to your MetaMask ⇒ (Assets) ⇒ Import Tokens:
- Paste the PRPS Contract: 0x972999c58BbcE63a2e398d4ED3Bde414b8349eB3
- Paste the DUBI Contract: 0x950e1561B7A7dEB1A32A6419FD435410daf851B0
- Paste the USDC Contract: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
You can verify the contracts on the bottom page of the official website prps.io.
You can also follow the steps in the video guide of iSkittles