Add a new region on a page

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May you live in peace all team of c5!

I am developing a page like portfolio on c5. When I edit the page for adding content on the right hand side of the page. The region of adding block not displayed on right hand side for adding block. Please guide me how to add a new region on a page for adding a new block. I attached screenshot.

Regards,
Sanodia Ijaz,

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