When I send usdt to MetaMask,I should input my address 0x1fe268D1768dFAda13ceBa49DE83CA46B0Bb8285,right?
What do you want to do with your USDT token? That 2 USDT is already stored in your address (0x1fe268D1768dFAda13ceBa49DE83CA46B0Bb8285) so you don't need to send them anywhere. You can access that address from MetaMask too, assuming you have the private key to that address.
MyEtherWallet and MetaMask are just a tool to access that address. As long as you have the private key, you can access your address from any Ethereum wallet (MEW, MetaMask, anything else.)