What's the problem with you? You can add another web part by clicking "Add a Web Part" button as your screenshot. Update: If your page is in Site Pages library, you can go to SharePoint Designer->Site pages in the left pane->find the page and Edit File in advanced mode. Add insert Web Part Zone via click the botton:


In Order to add a new WebPart Zone you need to create a custom Page Layout and use that page layout to create your SharePoint Pages OR you can edit your page in SharePoint Designer and add below code snippet to it. Reference: Create a Custom Page Layout in SharePoint. Then you can add below code snippet to add webpart zone to your custom page layout: <...

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