Don't worry about being confused by tutorials I know I was when I first started, it doesn't make you a bad beginner.

What bit of the tutorial exactly are you stuck on? one of the C4D bits?

And try I'll give you a few easy tips that you can slowly start to work on, don't try and focus on everything all at once though.

One of the most important parts of any piece of art is the focal point. It can be a building, an effect, a characters face anything you want to draw attention too.
Some of the easiest ways to do this in a signature is to 1 darken the edges by using a soft brush and brushing black onto a new layer and lowering the opacity to 20%, 30% or whatever you think looks best. You can also lighten the render itself by brushing, with a soft brush, white onto what you want to draw attention too and again lowering the opacity, you need to make sure you don't make it too bright though.
Another way is by using the blur and sharpen tools. Make a new layer with an applied image and with a soft brush on about 15% blur the background and sharpen the focal point. This will not only draw focus to your render but it will also create depth as well.

Another thing to look out for is lighting, try and follow the natural lighting on your render, if the render is lighter on the left hand side make the left hand side of the signature lighter as well. You can do this with black and white brushings on a lower opacity again.

And then Aether already mentioned about the font, keep it relatively small so it doesn't draw too much attention and make sure it's simple unless it's a major part of your sig.

This tut has some basic things about arrangement and colour as well as other things for your text, hope it's helpful:
http://warsh33p.deviantart.com/art/U...orial-38441798

One final thing is to try and get your render to blend into the effects and background a bit. You can do this by either smudging, but that can be quite tricky particularly if your just starting out. Another way is by using the burn tool and something called gradient maps which are in the adjustments section to try and match the colours better.
And finally, this way is easier for a beginner and creates an effect closer to smudging, is to get a soft brush with the eraser and just erase the very edge so you get a soft line instead of a hard one.

There are some other parts of sig making as well, such as flow and colour but to start off with everything can be a bit of an overload. Hope what I wrote helps you out a bit. If you've got any problems or questions just ask.