Create/Import Wallet

Step 1: After installing the extension, Click on Get Started
Step 2: You have 2 options to choose: "Import wallet" or "Create a Wallet"
Create a wallet
Import wallet
Step 2: Choose Create a Wallet
Step 3: Agree with the Privacy Policy
Step 4: Create the password
Step 5: Save your Secret Backup Phrase
Step 6: Fill out the secret phrase and Next
Step 7: Create successfully, click on All Done to finish
Now, you can see your wallet
Step 2: Choose Import wallet
Step 3: Read and Agree with MetaMask Privacy Policy
Step 4: Import the Recovery Phrase and set Password
Step 5: Now, you imported the wallet successfully
You need to set BSC Mainnet Network to play with MoonRat
Read here for the detail