PRAM reset = Shutdown Mac. Press Power button to turn on, and immediately press and hold down Command+Option+P+R. Hold these down until you hear the third chime. After the third chime, release all keys.
SMC reset = This all depends on what type of Mac you have, and whether the battery is removable or not. I highly suggest you go to Apple's support page and search for SMC reset. There it will list detailed ways to perform this for the model specific Macs.
Hopefully these help, if not, let us know and we'll try to help.