I'm going to repeat what has been said by every poster here, only because I feel it still needs to be said.
Manuals are your best friend. While you may have only wanted to know what the throttle is (+/- on the numpad), you still should have looked at the manuals everyone was throwing at you. If you had taken the time to, you would have found that there are complete control sheets in some, as pointed out by Tex, but also detailed descriptions of when and how to use the controls.
Which is better; "+/- is throttle. Have fun.' or '+/- is throttle, but if your vessel has scram jets, you are going to want to pitch to 70 degrees until you are about 25km in altitude...". Option one is what you wanted to know, option two if what you would have found in the manuals we directed you to. Not only would you then know
what the controls are, but also
when and
how to use them. Sure it would be easier for you to tell us to use the pedals when driving, as opposed to reading a long manual, but what do we do when we can't find the brakes? Is that something that could've been found in the manual?
When I first started put with orbiter back in October, I had never flown another flight simulator, so I didn't even have that to fall back on. I found the orbiter.pdf quite confusing, so I was
lost. But then, I found Go Play In Space, and, after multiple weeks of doing the tutorials found in it, I was able to launch into a steady orbit, dock with the ISS, do lunar transfers, and I recently had my first successful re-entry. Even after nine months, I'm still learning- because I had the patience to go through manuals. I will now point you in the direction of some great tutorials.
Tex's DGIV to ISS tutorial (you will have to download the DGIV
here)
Go Play In Space (ESSENTIAL)
Orbiter.pdf (Comes with orbiter-look in the 'doc' folder)
Good Luck, and if you still have questions after reading the manuals or doing tutorials, feel free to ask.