Hi Coolio10,
First thing is that you probably won’t be able to delete the first page (well, you could but there’s no need) - you can edit the first page to suit your content, it’s easy to change the content and page title to whatever you want.
The best way to start off is:
1. Log into your manager. (
http://www.yoursite.com/manager/)
2. In the tree menu on the left hand side, select the page you want to edit.
3. This will load a preview of the page on the right hand side.
4. At the top of the preview will be an option to ’Edit’.
5. Select that, and edit the page title and content to suit your needs. Save your changes and viola! no more install message.
More information on how to add and edit content can be found in the documentation section here:
http://modxcms.com/documentation.html
Hope that helps, but if you have any more questions then please post back.