What if I got paid $600 from another employer, but they didn't send me a W-2. I'm still in high school and have another job that I did receive a W-2.

[TomD8]

Enter your W-2 in the Wages & Salaries section as usual.  

If you didn't receive a 1099-MISC for the $600, enter it under Less Common Income > Miscellaneous Income > Income not reported on a W-2 or 1099.

If you did receive a 1099-MISC, enter it on the 1099-MISC line which is under Other Common Income.

>>Be sure you indicate on your return that someone else can claim you as a dependent (I assume your parents are claiming you).