Upgrading RAM

Foxconn P67A-S Intel P67 (Socket 1155) DDR3 Motherboard - (Sandybridge)
There's two black slots next to the two yellow ones which are holding my current RAM. Could I just buy more and put them next to them?
 
I am not overclocking. I have a Antec TruePower New 650W Modular PSU, what do you mean by check the voltages and how would I do this in BIOS.

So I'll just by this same RAM I linked/brought previously and slot it in and I then have 8gig opposed to 4gig?
 
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