A RPC (Remote Procedure Call) is a set of protocols and interfaces that the client interacts with in the blockchain system. The user can query blockchain related information (such as block number, blocks, node connection, etc.) and send transaction requests through the RPC interface.
Here are steps to change the RPC in MetaMask:
Step 1: Click on the top right corner profile picture and then on ‘Settings’.
Step 2: Click on ‘Networks’.
Step 3: Select the network which RPC information you want to update.
Step 4: ****Delete the old RPC URL.
Step 5: Add the new RPC URL and click on ‘Save’.