To edit your website's presentation, go under the Online Presence section in the left column and click Site theme.
In the left column of the Site theme page, click Template. In the dropdown menu, you have the choice between 5 designs. Select the theme of your choice and check the preview on the right.
You can also change the colors and the font by clicking Color and Font.
If you have chosen the third or sixth theme, you can choose the homepage background by clicking Background below Font.
Once you customize your website, click Save at the top of the column and above the themes. If you don't want to save the changes, just Exit.
Above the right image of your website, next to the Preview tab, you can choose the background picture of each page of your website by clicking Pictures.