Well... There are several ways to do this. First thing is first though.
1. You need to go into the admin section, select User manager, and select your name. Change the Editor from WYSIWYG to Standard.
2. Save your profile
3. Than depending on your template type and the location you want it. (For this example lets say it is the footer)
4. Go into Modules
5. Create a new module
6. Custom Module (also call HTML)
7. Enable the module
8. Add your code into the text box at the bottom.
(Now in hind site, there are several different Modules already built for J! - Just by installing them)