Go to Zeplin and open up any design that you would like to embed. Click the "Share" button, click the three dots for "Scene" and select "Copy Link" option to copy the scene URL.
Open a page or a post in AllAnswered. Paste the copied URL on a blank line and hit enter key. You will see the Zeplin design magically appears.
Alternatively, you can also use the Media menu of the editor to embed the design.