Originally posted by Ira Lex, you have to spend a lot of time reading that section of the manual. And learning when you want to use that pop-up flash.
The camera's high ISO quality makes flash not necessary in many situations, and at the very least, not the best way to take the shot.
And the LAST thing you want is for the flash to pop up in an auto mode. You always, always, always want to decide on flash when you decide to use it. Never in an auto mode.
If you're interested in learning some basics, the first thing I suggest for now is don't use auto ISO. Set it to MANUAL.
Then, you can learn how to properly use your flash.
I agree with Ira wholeheartedly on this one!
The K-x's pop-up is ok for a bit of 'fill flash' (I use a 35mm film can as a diffuser too) but that's about it... Using ISO effectivly means you need flash very rarely...