This step can be tricky depending on where your pad is. It is easy if a concrete truck can reach the pad with its' chute, but if not you will have to use a wheel barrow or power buggy to move the concrete from the truck to the forms. The concrete must be poured quickly so you have time to move it into place while it is still wet. Essentially, screeding is leveling out the top of the concrete. Run a strait board on the top of your forms across the concrete, if there is a large pile-up, have someone rake back the pile so you can proceed with the screed process.  It is best to have one person on each side of the screed board and pull back the concrete simultaneously. If your pad is too large or not in a position to be screeded from the outside, one person or both people must stand inside the pad and do your best to run the board along the 2x4s. If you cannot perform these two methods for screeding, it is suggested you seek help from a more advanced concrete finisher. Bull floating is the first step of smoothing out the concrete. It will knock down all of the rocks and bring the "creamy" concrete mix to the surface. Doing this correctly should leave your pad flat and smooth with no holes. The "wetter" the concrete is, the easier it will seal all the holes up; if you wait to long to bull float, it will be hard to seal the surface. If some holes will not close up, you can sprinkle some water to aid in the process. Hand edging the concrete will create a nice rounded edge as opposed to a sharp rigid one. It will also seal the edge. If an error is created in the edging process, use the hand float to clean up along the edge. The hand float should be used to seal up any holes that are reachable. After the first round of sealing the surface by bull floating and edging, it is generally time to do the process over again. The objective is to get the bull float lines and edger lines to go away, while the top remains smooth.  This may take some time depending on weather, if the sun is out it it will dry up quicker. There is a video tagged in these instructions that will help you learn how to properly finish concrete.

Summary:
Pour the concrete into your forms. Screed the concrete. Bull float the concrete. Hand float and hand edge along the outside. Finish bull float and edging.