Open the Liquid menu by clicking your user icon in the top-right.
Click on API Token.
Click Create a New Token.
Select the permissions for the new API token and input a 2FA code, then click Create Token.
The newly created API token will be displayed under the ‘Manage API Tokens’ heading.
Note that the Token Secret (redacted in the screenshot) is displayed only once, so you'll need to make a backup.