How to add dop testnet to MetaMask?

Could you please elaborate on the process of adding the dop testnet to MetaMask? I'm a bit unfamiliar with the steps involved and I'm curious about the specifics. Are there any prerequisites that need to be met before I can add the dop testnet? How do I go about adding the network details, such as the RPC URL, chain ID, and so on? I'd appreciate it if you could guide me through the entire process, step-by-step.