EVAP CEL Reset?

[Coffinhunter]

My check engine light came on last night. I was only a couple miles from home and the car was running fine, so I continued to my garage. When I got home, the first thing I checked was my gas cap (I have had that issue on other cars), and sure enough, the whole damn thing was gone. I went to the gas station that I use this morning, and they had my cap. So I put it on, went to Advanced Auto, just to make sure that was in fact what the CEL was for, and yes it was for EVAP. I can't remember the rest of the info.

Now my question is, how do I reset that light? They said they could not do it at Advanced.