Completely lost on editing and updates

[DrByte]

2. Edit that header so I can put our active phone number in the header. Also, if I have to make a new header how do I do so?

Simple:
a. right-click on that "header" image and choose "open image in new tab" or some equivalent from the menu that appears.
b. there you'll see that the URL for that image is: http://www.qualitymasonicrings.com/i...mages/logo.bmp
c. thus the actual image file to change is located on your server at: /includes/templates/gloss_black/images/logo.bmp
d. use your image-editing program to edit that file, or to create a new one of the same size dimensions, and save it with the same filename
e. upload the new image to your server, to replace the file that was up there previously

[qmrings]

Thank you for that information.

This next question is probably going to sound dumb, but where do I go to upload the new image so I can replace the file?

Thanks!

[DrByte]

As stevesh told you in previous posts, one normally uses an FTP program for that.
If you can't use FTP, you could optionally resort to using your hosting company's File Manager app to locate and upload the replacement.