Hopefully you have had success by now, but here's a reply after figuring mine out via trial and error:
After many failed attempts at selecting various Baofeng models from the menu, I had success with the UV-5R selection for programming my UV-S9PLUS radios. I hope this thread is helpful to other owners of this model.
1. In the CHIRP program, click on RADIO in the drop down menu DOWNLOAD FROM RADIO and select Baofeng UV-5R.
the Software may give a disclaimer that it may or may not be up to date. (I have a hunch these UV-S9PLUS radios are close cousins to the UV-5R)
2. Click OK to Acknowledge the disclaimer and continue.
3.Then it instructs you to turn your radio ON while connected to your programming cable, and make sure the knob is turned up to Maximum Volume, and on a frequency that is not active. Removing any antennas probably helps. Click OK, A light will flash on the radio indicating it is busy. A status bar on the computer software will also appear.
4. Then, after a successful download of the radio, you have to copy/paste your programming onto the downloaded radio tab, and over-write it with your pasted data. This assumes you planned out all of your channels and frequencies in a separate tab/file.
5. FINALLY, To upload this info to the radio, choose RADIO from the drop down menu and choose UPLOAD to RADIO. This option was greyed out on the menu until you made changes to the data (via cut/paste) on the recently downloaded radio tab. There will be a status bar just as during the download. A light will flash on the radio indicating it is busy.
6. If you had success, print out the csv file of your channel lists onto paper for reference and keep it in a notebook. I found that only the frequencies display next to the channel number on my UV-S9PLUS. Even though I took the time to add text to the fields in CHIRP, they do not display on the radio. Therefore, having the printout offers a helpful reference.