you might need to learn how to edit page types.

Do to myurl.com/dashboard/pages/types/ click on "defaults" for the page type you are using and you can edit it there. If you need to make more significant changes you can edit the page type through your FTP. Use a FTP client (filezilla for example) and navigate you way to your theme folder and find the php document that cooresponds with your page type.

There are various articles about editing page types and how to do it so that an update doesn't overwrite them.

Not sure if this is exactly what you were after.

http://www.concrete5.org/documentation/general-topics/page-types/...
http://www.concrete5.org/documentation/how-tos/designers/adding-you...

I see you have already asked this question here:
http://www.concrete5.org/community/forums/usage/getting-rid-of-the-...

What part of the advice was confusing you? Several people took the time to answer your question. Have you installed a FTP program as per the original advice?