Welcome to A.S. Jerry!
Different chains may have different recommended angles - it can make you nuts. The bottom line is that the
exact angles are not as important as getting
both edges (top and side) on every cutter sharp, and getting every cutter on a loop the
same.
30 degrees is a good starting point for the the 'top plate angle' - the angle you see when you look down on the chain from above. This is controlled by the rotation of the chain holding vise.
The 60 degree angle, Moparmyway refers to, is for the tilt of the grinder head. However, I think that this angle is fixed on the HF unit (probably at 60 degrees?).
As you read through other grinder / sharpening threads, you will see references to other types of adjustments that may be available on different grinders.
Make sure that you use the right size grinding wheel for your chain. Some how-to-use videos on Harbor Freight Chain Saw Sharpener on YouTube might be helpful.
Harbor Freight Chain Saw Sharpener - YouTube
Philbert