Rexico,
If you're that close to it, you shouldn't need to "go to" the newly created waypoint. You can just go to the map screen of the Humminbird and the waypoint should show up there. You can drive the boat to the spot. What I normally do is drive my boat back around and find the piece of structure I want to fish. Once I see it show up on my SI, I get ready to drop a buoy. As soon as I'm past it, I drop the buoy. I turn around and do it again (get to the other side of the structure and drop the buoy).
If the structure is deep enough, you can drive boat directly over the structure. I'm not a big fan of driving directly over a piece of structure so I know that my buoys might be a little bit away from the structure. To find out how far away the piece of structure is, you can do this in SI screen. Move the cursor to the piece of structure and it'll tell you how far away it is. If you still aren't sure where the structure is relative to the buoys, you can throw a search bait that can feel the bottom. I love to bass fish so I usually throw a jig or Texas rigged worm and feel my way around the bottom. Then I know for sure where it is relative to the two buoys I threw out.
Hardest part after that... Just make sure the camera is in focus when you get your picture taken with that fish!