To create a new service:
1) Go to Create>Service
2) Give it a title, upload your image, and select which section to have it in (Printing, Public, Classes)
3) Fill out the body. If you are having problems pasting in text from elsewhere, right click, and select Paste.
 
To edit, navigate to the service you want to change and click the title of the service (not the tabbed panel titles), then click "Edit" on the next page. Once done, scroll to the bottom and click Submit.
The tabs on the left of each service page (Printing, Public, & Classes) are sorted by date added. To change the order, change the date under "Authoring Settings" on the edit page of the service.