Step 1. Please go to Lootex official website :

 Make sure you are using Chrome browser to go on Lootex website since MetaMask is a Chrome extension.

Step 2. Tap the "Connect Wallet" in the upper right corner 

Step 3. Select MetaMask

Step 4. MetaMask extension will pop up, login with password or backup phrase 

Step 5. Once the wallet is logged in, it will show "Connected", then click Done 

Step 6. Check the upper right corner of Marketplace, if the wallet address appears, it means success!