If you mean codes as in HTML and such, no you dont.
I couldnt make head nor tail of it for a few days when I opened it at first
Other people seem to pick it up quite easily.
I had to read the help files and play around with it a lot before I could get something that was worth calling a sig.
Once you have grasped the basics just keep experimenting with the different options until you will soon find you can do a decent sig in a few minutes, once you have the gifs, jpgs and sounds already saved that you are going to insert into your sig or flash animation