Set the gain on the mic to around 30 percent.
Make sure the Pattern knob is set to cardioid (the upside down heart).
Position your mouth about six inches away from it and talk into the side (not the top), and make sure it’s the side of the microphone with the Blue logo facing you.
Though not necessary, it’s always helpful to use a windscreen and pop filter if you have them.
You can also get an arm mount for your Yeti. Here’s a recommended one that includes the mount as well as a windscreen and pop filter: View on Amazon