First of all you will need to get two boxing gloves, using this recipe:

If you want to change the glove's color, you can use this recipe:

Once you have two gloves, you'll need to put them in both your main-hand and your off-hand. You will look like this and on the left of your hotbar, you'll see a bar. This bar goes up when you hit an enemy, but if you get hit, the bar goes down to zero. This works like a combo system.

To hit with your gloves, you'll need to right click, and right click, NOT left click like a vanilla hit. When you right click, either your right or left hand will swing at the enemy. You will get a cooldown and damage the enemy depending on your health. Here's the chart :

Once you have a full bar, you can either press the keybind U or I. If you press U, you'll activate the uppercut, and the next time you hit an enemy, he'll get knocked up farther than usual. If you press I, you'll activate the blast. When you hit a enemy, he will be knocked back far. Each of these special attacks have custom animations, and once you use them, your bar will go back down to zero

Lasty, when you press the keybind R, you will be able to block. When you block, you will see 3 shield icons appear under your crosshair. These act as "strikes". When you get hit while blocking, you'll be knocked back less than usual, and you will take no damage, but you will lose one of the shields. When you have 0 shields, you'll automaticaly stop blocking.