Re: Comet NEOWISE (C/2020 F3)
Do you have APCC Standard or Pro? If you do, the included Horizons program will extract the JPL data and set up the mount for you.
Demos at https://www.astro-physics.info/index.htm?tech_support/software/apcc/apcc-download
See section 13 in Standard or Section 14 in Section in Pro
If you do not have APCC, then I am sure Ray can provide insight on how to use the Custom tracking rates.