OK there was a similar post by MMA_Crypto on this but that was prior to FTM mainnet being on Binance.

Part 1 will be setting up Fantom Opera Mainnet on Metamask.

Step 1

Log into metamask and select the Drop down menu:

Then select the Settings option:

Then you need to select Networks:

Add new Network:

Then this is where you need to enter all the relevant details:

I've added the addresses incase you want to copy them 😊 

RPC URL:  https://rpc.ftm.tools/

Block Exp URL:  https://ftmscan.com/

Then save, Fantom Opera should now show in your Networks:

Hope this helps, step 2 will be about transfering FTM to Metamask on the FTM chain.

@LGuigs