Scroll to the bottom footer and click the “Add Polygon Network"? button.
To add Polygon’s Mainnet, click on the Network selection dropdown and then click on Custom RPC.
It will open up a form with 2 tabs on the top, Settings and Info. In the Settings tab you can add Polygon Mainnet in the Network Name field, URL https://polygon-rpc.com/ in the New RPC URL field, 137 in Chain ID field, MATIC in Currency Symbol field and https://polygonscan.com/ in Block Explorer URL field.
Adding HODL Tokens
Manually adding token details is necessary with certain wallets, like Metamask. See below for instructions.
Switch to Polygon Mainnet by clicking the drop down at the top of Metamask.
Click Import Tokens at the bottom of Metamask.
Click the Custom Token tab.
Paste the token contract address into the contract address field.
The rest of the information will automatically populate.