Setting up a CDN service is relatively easy. The fifth step can be completed once the publishing application is installed and it can be logged in. Alternatively, the registration and pre-configuration of the user account would be done on behalf of the customer, after which the user account's email adddress would be replaced by the customer's email address.
registration of a user account to BunnyCDN
creation of a pull zone ID (see image 1)
adjusting other important pull zone settings (see image 2)
prepaying for the usage time (e.g. PayPal payment) after 14 days at the latest (the trial period of the BunnyCDN will then end)
setting the CDN address  in the settings of the publishing application, both at the managing interface and in user's settings