HIRP is a free, open-source tool for programming your radio. It supports a large number of manufacturers and models, as well as provides a way to interface with multiple data sources and formats.
To get started:
Download CHIRP for your platform. https://chirp.danplanet.com/projects/chirp/wiki/Home
Check out the "How to get help" page, and the rest of the Documentation. https://chirp.danplanet.com/projects/ch ... o_Get_Help
Be sure to review the FAQ. https://chirp.danplanet.com/projects/chirp/wiki/FAQ