Here's how I do it...
Start the car and let it warm up to operating temperature. Shut it off and open the hood.
In the middle of the intake is a vacuum tee fitting with a large line going to the drivers side and a small line going to the passenger side. Disconnect the small line at the tee and plug it (I use a golf tee). Use a piece of vacuum hose (from parts store when you pickup the Seafoam) and connect it to the tee fitting where you disconnected the small line. You want a section 2-3 feet in length. Pour approximately 1/3 of the can into a small open container (I use an old coffee cup).
Start the car and let it idle. Use the end of the hose like a vacuum cleaner and suck up the Seafoam from the cup. Do not submerge the line into the liquid and try to keep the car running. You basically want to suck the Seafoam in as quickly as you can without stalling the car. The object is to drown the interior of the intake manifold with the Seafoam without actually burning it in the cylinders and getting it in before it can evaporate. Once you have vacuumed all the Seafoam from the cup shut the car off immediately and note the time.
Now undo the attached length of vacuum hose and unplug the small vacuum line and reconnect it to the tee fitting. Check the time. The soak time allows the seafoam to penetrate the gunk in the intake manifold and loosen it up. After 10 minutes of 'soaking', restart the car. It may need some help with the throttle to get it to stay running. Once it is running good, start giving large amounts of throttle and observe the exhaust for smoke. Don't go crazy and redline the motor but keep revving the motor until the smoke clears.
Now the important part. Take the car for a drive. Find someplace where you can safely drive spiritedly.
You want to exercise the car thoroughly. I recommend turning off the OD and do several WOT runs (safely!). You want to get the engine rpms well above 3000 rpms so the IMRCs open. Do this several times observing the smoke in your mirrors. Once you see no more visible smoke, return home.
Repeat the process until you get no more visible smoke show. I've done it as much as 3 times back to back. Any leftover Seafoam is best just dumped into the fuel tank.
Depending upon the amount of buildup in the intake, you may want to change the spark plugs when you are done. Some have said they have gunked up the plugs with the seafoam process. I've never had any issues, but if you suck in more than the recommended amount you could loosen up too much crud at once and experience these issues.
Now go have a good smoke show!
Edit: I just realized you have a Gen2, so your choice of vacuum source will be different from what I described as I have Gen1s. I chose the tee fitting on the Gen1 as it is easy to access and distributes the Seafoam in the middle of the intake. I know some have used the vacuum line from the PCV valve but I personally do not like it as it goes to the throttle body. Just my opinion.