Lets start with just the basic button. Copy and paste where you would like to use the button. Change the value="NAME OF BUTTON" to what you would like. Also the url to where your visitors will go when they click it.
And this is what it will look like..
Now lets add some color to this boring button. Copy and paste where you want the button to appear. Changing the value="NAME OF BUTTON" and also the background color and font size and face. Also the url to where your visitors will go when they click it.
And this is what it will look like..
Ok now we go all out on this one just copy and paste where you want the button. Change the value="NAME OF BUTTON" and also the font size, font color, border color, border type, border size, and the background color or image. Also the url to where your visitors will go when they click it.
And this is what it will look like...
There is really no limit to what can be done with a button. This should get you started though.