https://www.amazon.com/Headphone-Splitter-Computer-Smartphone-Headset/dp/B07PBSTHDS/ this is just one example but there are a lot of option like this on amazon and other websites

another question, i see that there are 2 ports for headphones and microphones. Do i need to buy a splitter to use my headphones with the amp or can i just plug my headphones into the headphone port and it should work fine?