RAM UPGRADABLE?

Your RAM cannot be upgraded.

The RAM modules are soldered onto the logic board and cannot be removed and then upgraded.

They have mentioned which mac they have,

MacBook Pro 13'' Retina's(Late2013)

The RAM cannot be upgraded.

You haven't mentioned which model. Check if it possible here: https://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade

Eau Rouge, you are absolutely correct. uddhavug10, please disregard my reply.