"Sliders" ?
On the page that has the "fly now" over on the left hand side you'll see a menu, at the bottom "Settings", click it and there you'll find the "sliders".
Note the tabs at the top, "General", "Display" , "Weather" etc. Under each of those tabs you'll find settings that you can adjust, if you hold your mouse pointer over each one a tip will pop up below telling you what it does.
The "Display" tab is the section you'll spend most of your time, it is there you can set your screen resolution, frame rates , and other settings to make your sim look better, remember most of these can't be set to the highest possible mark without affecting your frame rates (you'll know when you have it set too high, you'll be flying and it will look like you are watching a slide show," stutters") This is the hardest thing too do you must adjust each one a little at a time, the higher you can set them without major stutters the better your overall sim will appear.
This is also the most asked question about how to set your settings, and it is almost impossible for anyone to answer because no two computers are a like, all we can do is give tips to help you out but there is no one specific setting arrangement. You'll need to play around with each one a little at a time, fly around and see how it looks. All trial and error.
Your main goal is too make your flight simulator appealing to you! Have your setting set the way it looks and works best for you. And after a while you'll be into the hardware up grades and etc. and answers to those questions can be found here too! But "baby steps" LOL!!
