To create API username and password, do the following.

First click on your account name (1) in the upper right corner of the page. From a dropdown menu opens choose "Preferences" (2).

The account settings view will open in a new window. From there, click on the "Integrations" (1) tab and then underneath API Passwords vlick on "Create a new user" (2).

After clicking the button, new API user and password will be generated for the account. It will show you your account subdomain, API username and API password. Save the password to a secure location, because this will be the only time the password is shown. 

You can create several API users and you can add a description to each user. We recommend adding descriptions, so you can keep track where and by whom the API's are being used. After you've added a description, click "Save", to save the description.

If you want to delete a user, click on the red thrashcan mark next to the user. Before deleting a user, be sure that API connection isn't being used anymore or else the connection stops working.