It's really easy to create your own signatures on this board. You can have text or can use images (like blinkies).
To start, click on the User CP button up in the welcome area. You'll see a row of buttons to the left under the Options heading. Click edit signatures. The page that comes up is where you add a new sig and you can also come back and edit later if you want. You can also create several different signatures.
To do a basic text sig: Give your sig a name where it says Sig Name. Then in the box below, you can type in or c/p the text you want. You can use BbCode from the little drop down menu to change the colors or size....you just need to make sure your text is between the tags. You can use preview to make sure it looks the way you want and once you have it, just click add sig. If you only have one sig, it will become your default signature. If you have more than one, on the main sig page, you'll get the option to check which one you want as default.
To use an image as a sig: This is done almost exactly the same way except that you need the URL to the image you are going to use. Instead of typing in text, you would use BbCode and the IMG tags. When you click Image in the list, it will give you a popup window asking for the URL. Enter it and click ok and it will be inserted for you. Then you can preview and click add sig and you're done.
If you've got any questions about this, please ask.