I started a new Squarespace site but am not new to Squarespace. While initially setting it up, I chose a Blank Template because I didn't want to take the time at the moment to browse templates. Now that I have the site in my account and a few basic settings in place, I'm ready to choose a template. However, I cannot see a way to switch templates. When I go into the "Design" menu, there is no "Template" option. It's missing. (See image.) Is this because I chose a blank template? If so, how can I add a regular template?