A. You can substitute the basic SharePoint theme for one of the built-in themes by performing the following steps:
- Navigate via Microsoft Internet Explorer (IE) to the Sharepoint site whose theme you want to change. (You must be a user with "Web designer" privileges.)
- Click Site Settings.
- Under Customization, select the "Apply theme to site" option.
- Select the desired theme from the list to view it in the Preview window and click Apply, as the figureshows.