Looks like the one i bought.. Yeah, it's a real pain in the ass to figure out... the black part around the outside of the dial should be split up into small little individual pieces (might take a magnifying glass to see, lol)... they are 15 minute intervals... so for the distance between 6 am and 7 am, there will be 4 little prongs.. they push down.. It took me like 2 hours to figure it out... then i laughed at my high ass...
Push down all the pieces for the time you want the light on (atleast that's how mine was, it may be backwards though)... Set the dial at the current time, plug it in, and turn the switch on...
