I need to add more RAM, what do I do and how much do I need?

I have an imac. It is a 21" 2011, 10.8 op system  with 4 gigs of ram. It has begun to show the "colored wheel" and a few of the programs that require a lot of ram lock up. I was told I needed more RAM. Where do I buy it, what kind do I need, and how much do I need?
Do I need to buy it in pairs?
Thanks for the help, Mike

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Check out the basic memory costs and do your sums.
Guide to required RAM.    Lookup Mac Specs By Serial Number, Order, Model & EMC Number, Model ID @ EveryMac.com

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