Power OFF the Pyle.
Hook up your PHONE directly to the BUS input on the Pyle.
You will likely need a 1/8" stereo to RCA cable, and if your phone doesn't have an 1/8" jack on it, you will need an adapter to provide one. These are all readily available.
Links for products are below.
Set the switches on the back of the Pyle so that each 'BUS/LINE/AUX' switch is set to 'AUX'.
Set the switches on the back of the Pyle so that each 'R R+L L' switch is alternating between 'R' and 'L'. Don't let any be set to 'R+L'
Set the switches on the back of the Pyle so that each 'Bridge On/Off' switch is set to 'OFF'.
Power on the Pyle.
Play audio through your phone at a low to medium volume.
Assuming that there are speaker wires hooked up to ALL the outputs of the Pyle already, then audio should play from your phone through all the speakers that are hooked up to it.
This is first level testing, and it will take a fair bit of work and effort to figure everything out with that product. If things are broken or miswired, which is quite possible with that particular product brand, then it may contribute to your confusion.
If you aren't that interested in figuring it out on your own, then you may need to hire a professional to figure it all out for you.
Product page:
https://www.pyleaudio.com/sku/PT8000CH
1/8" to RCA adapter cable:
https://www.amazon.com/AmazonBasics-3-5mm-2-Male-Adapter-Stereo/dp/B01D5H8KO2/ref=sr_1_1_sspa
Phone adapter (for iPhone):
https://www.amazon.com/Apple-Lightning-Headphone-Jack-Adapter/dp/B01LXJFMGF/ref=sr_1_3
Phone adapter (Android/USB-C phones):
https://www.amazon.com/Headphones-Adapter-Compatible-Essential-Devices（White）/dp/B085NQBGJM/ref=sr_1_1_sspa
