Shared Hosting & Root Directory Problem

I have a problem and I'm hoping some one here can help me. I purchased a shared hosting account with cPanel.

Along with the original domain connected to the hosting I added another two domains. I used fantastico to install wordpress on an add-on domain. However when I try to use fantastico again, this time on the original domain, it won't let me. Giving me an error stating that I already have one script running on the root directory. . .

So how do I install on scripts on add-on domains with out installing it on the main root directory?

You must choose the associated addon domain folder that you chose when setting up your addon domain (generally it defaults to the name of the addon domain)

You can find this addon domain folder within your Public_html folder

So after you have installed wordpress in this folder, you can access it by going to your addon domain.

Hope this helps let me know if you need anything else