To create API username and password, do the following.

Click on your name in the upper right corner of the page.

A dropdown menu opens. Click on "Preferences".

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

Username and password will be generated for the account. 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 changes", to save the description.

If you want to delete a user, click on the red "X" 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.