To edit the skin that you have selected for a Self Service site:
Log in to the Business Control Center running on your agent server.
Choose Service Administration > Service Administration Configuration >
Project Name
> Self Service >Site Name
> Skin Settings.Edit the Skin CSS and Skin JavaScript fields as needed. Select or deselect the logo placeholder if you are using the Simple Tabs skin.
Save your changes and deploy the project.
Note: if you modify any of the skin settings on the Skin Settings page, you will override all the other settings also. The Service Administration application will no longer update the skin settings for your site if the corresponding settings for the default site are changed.