You need to follow these steps:
- Step 1: Go to Pages > Add New Page. In Template box, choose “Front Page” and choose “Sidebar” in Header Style box.
- Step 2: Go to Appearance > Widgets > Drag widget “Text” or “Visual Editor”(If possible) in “Main Top Sidebar”. enter HTML code in widget “Text” or use “Smart Content Box” in widget “Visual Editor” and save it.
- Step 3: If you want that page to be the Homepage, go to Settings > Reading > A Static Page > select Front Page.