The Sitebuilder step in a hosting plan creation or the Sitebuilder tab among an existing hosting plan properties allows you to enable a Sitebuilder service for the Hosting Plan.
This can be done if you have any Sitebuilder nodes registered. To add a Sitebuilder service to the Hosting Plan, click the Edit button, and on the opened page check the Enable Sitebuilder service for this hosting plan box, select the Sitebuilder plan and enter the fees.