Tokens are generated from the settings dashboard. Navigate to Account at the bottom of the sidebar, click Settings, then click Tokens.

This interface shows user-generated tokens that have been created for the current user and information on their current state and expiration date. Existing tokens can be disabled from this interface, which temporarily deactivates them, or revoked, which permanently invalidates them. To generate a new token, click Create Token. This will open a token creation dialog:

Give the token a useful name, provide a description, and specify the date when the token should expire. After clicking Generate, the token will be displayed one time only for security purposes. It can be copied and used as needed, but should not be stored in any insecure manner.