If the FD came with the bike: Go back to the basics. Loosen the cable and adjust your high/low. Re-adjust your height and alignment (google, just to make sure, you're doing it right). Not all FDs are the same, it might take some experimentation.
Also remember that you should not use opposing cogs/chainrings. Meaning never biggest with smallest.
For beginners it is a hit or miss job, but with experience it gets easier