Even if you already have a home page, you'll need to create a new one since Solar needs a blank page to automatically pull and display your blog posts in the magazine layout. You can create a new homepage by going to "Pages" at the top, click on the "+" icon and select "Standard" page.

Once you create a new homepage, apply the "solar" page layout to the new homepage. You can do this by clicking on "Pages" at the top, select the homepage on the left, and under "HEADER TYPE", select "solar".

If your site doesn't have a Weebly "Blog" page, then create a new "Blog" page. You can do this by clicking on "Pages" at the top, click on the "+" icon and select "Blog Page".

Come back to this screen and fill in the input boxes with the URL of your "Blog" page and 3 category URLs from that blog.