Adding RAM?

Yes. It should be outlined in your computer's user guide or look here: How to remove or install memory.

It depends on which Mac model you have; append the last three characters of its serial number to http://www.everymac.com/ultimate-mac-lookup/?search_keywords= , load the page, look up its specifications, and if it lists a procedure for upgrading that model's RAM, ensure you're comfortable with doing it yourself.

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