The "analog" indicator above the input is actually referring to audio, but you're right that it needs to get changed as well. Let's see if I can help you out here.

Step one: make sure you have a composite, s-video, or component monitor output connection between your 990 and your display - and then set your TV to the corresponding input. Personally, I have my component monitor output connected to the "Component2" input on my TV (used for watching certain inputs like cable TV and my DVD recorder, and for accessing the 990's menus).

Step two: Once you are viewing an analog monitor output from the 990, press TNR on the 990's remote (once those batteries get replaced) and hit the "MENU" button just above the channel controls (there's a button farther down with a secondary label of "MENU" but that's for certain DVD players). This will bring up the 990's setup menu.

Step three: The first menu option is INPUT CONFIG. Select that, which will take you to the video input configuration screen. Pick the first input that you want to configure. Let's say that it's "DVD" for the OPPO 981HD. That will take you to the screen where you can select both the video input (DVI1 or DVI2, whichever the 981HD is connected to) and the audio input. Scroll down to "VIDEO INPUT" and use the left and right arrow buttons to pick the right input. It will offer you all three component inputs (COMP-DVD, COMP-VID1, COMP-VID2) and both DVI inputs (DVI1 and DVI2) as well as the s-video and composite video inputs. Once you've got the one you want picked, go to "AUDIO INPUT" and scroll left/right until you have the correct digital input selected. (And, by the way, you'll need to make a digital audio connection of some sort between each of these sources and the 990. Since you're hear anyway, this is the place to take care of that.) The other settings can probably be left alone for now, although if you want to you can edit the input's name (such as changing VIDEO1 to "SATELLITE"). Once you are done with this input, go down near the bottom and select "RETURN TO VIDEO INPUTS" to move on to the next input.

Step four: There are other menus to work on at some point, but I wouldn't go much farther until the amp is connected as a lot of the other setup will relate to speaker configuration and test tones. If you want to, you can just exit the menu by pressing the "MENU" button again, change the TV's input back to the DVI or HDMI input, and see pretty pictures from the satellite box and 981HD...