The page description meta tag is the description that will be shown in search results.
In order to edit the page description:
1. Click on pages >> click on the gear icon next to the desired page.
2. Select ‘SEO’
3. In the window that opens, insert content into ‘Description meta tag’ and save.
At the bottom of the SEO window you can find a visual example.
Please be advised that changes to SEO values take upto 24 hours to take effect after publishing the website.