Use a unique password and store it securely either on a password manager like Last Pass or 1Password (there are more options, search for 'Password Manager' on Google) or on a non-digital medium (piece of paper stored in a safe, hard-drive disconnected from the internet). In any case make sure this password is not accessible by anybody else than you. The wallet you are about to create will contain all your crypto assets, including the Ant Token, and if anybody can access this password and your Metmask, it will have access to all your crypto assets. Once you've written and stored the password securely, fill it in the Metamask fields and click Create.