OMG I was making it so much more complicated than it had to be. I got it to work, and here's how I did it (just in case anyone else would like to know

)
1.uploaded the image I wanted to use to my public_html/images folder
2. went into Tools>Define Pages Editor
3. switch Text Editor from 'text area' to 'htmlarea'
4. went into define_main_page.php
5. click on 'insert image' icon and place cursor where I wanted the image to appear...a box pops asking for the url of the image and I just put /images/nameofimage.jpg and waalaa image appears
6. to make the image linkable I just clicked on the 'link' icon and put the url i wanted the image to be directed to.
PS if you want to take the image out, I noticed that you have to switch back to 'textarea' to do so. I wasn't able to delete it in the 'htmlarea' for some reason
Thanks again for your help!!!