Steve,
A few minutes ago I did successfully get the printer working from one computer. I found it necessary to follow the instructions carefully. The instructions I had did not describe where to install the two print heads, but see the printer between "Remove Packaging Materials" and "Installing the Print Heads". They should have put an arrow in there, describing exactly where the print heads are to be installed. When you lift up the cover, it's in the center, towards the back. This is where the orange protective plastic piece is to be found that is removed as shown in steps 1 and 2. I assume your instructions are the same as what I had.
This G7020 unit does not have ink cartridges but rather ink bottles that you pour into the appropriate tank. The PGBK bottle is the black ink and the colored ink is identified by C, M and Y.
If you are planning to use a Cat5e cable for a LAN wired connection, the port is in the back. It can't be seen because they put in there a white/gray plastic piece that covers it. Since I already had a cable available, that is what I decided to do (rather than using wireless). For the driver installation and getting this to work it can be a little complicated. They gave me and assume you too a CD-ROM for the drivers. Now some computers do not have a DVD-RW/CD-ROM tray for that, so you can either use an external DVD-RW device that connects to the computer with a USB cable or you can download the drivers as instructed.
I found that since I was planning to use a wired LAN connection, I had to enable that in the printer first (in the menu). Canon does provide good instructions for that with a google search. Once that is done then you can install the drivers. Hopefully it should find your printer on the network. In my case it did (Yay!).
I put in there plain paper and tested it. Success!!! 😀 Hey I didn't break anything so far. That is good news being that there is plastic everywhere. 😀
I hope that helps.
P.S. I'll edit this for a couple of more things. If you are using plain "letter" sized paper instead of A4 paper, you have to move the plastic blue piece to the correct location in the cassette. Be sure you know about that. It can be a little confusing.
Photo paper apparently is loaded in another tray (maybe...I'm still reviewing that). That will be something I want to do on another day. First I'm going to buy Canon photo paper that is good for this unit. I don't want to take a chance. I don't want there to be any reason that the paper jams again.
Another edit: OK, I did find that we load the photo paper in the back. We remove the covers and slide the blue plastic pieces to the width we want. Now, I can't wait to test that, as soon as I purchase the Canon photo paper. I hope that will be tomorrow.