This site is being deprecated.
Please see the official X‑Plane Support page for help.
There are only tool tips on some parts of the UI. There should be tips on each of the rendering sliders. If you are not seeing them, check for plugins that could be interfering. You can file a bug report with screenshots + a log.txt here.
You can turn off and on tool tips for instruments in the cockpit by going to settings > general > flight model & checking/unchecking "show instrument instructions in the cockpit."
This site is no longer being actively maintained.