What he did was jump the power connector that would go to your case on/off button. If everything went together smoothly and you didn't have to force any connections to fit I would just go ahead and complete your build. Just take your time and go over all of your connections, especially from the case to the m/b to make sure the +/- are correct and you should be just fine. If things don't start up just go over every connection, it is almost always something little you over looked vs. a bad part.
One thing most people will advise you on after seeing that picture is as soon as you can replace that stock cooler on your cpu. They are loud and don't cool very well under load. A decent after market cooler can run you $30-70 but is well worth it and can knock 10c off of your temp easily. Just remember that not all of them will come with a fan so you need to check on if you have to add one to the purchase.