The key to dealing with anger is externalising it.

You can do this by:

Speaking about it to a trustworthy person, writing about it, or any other means of expression that works for you.

Anger is very physical, so physical ways of externalising it can be be particularly helpful. Some examples are:

Going to a place where nobody can hear you and shouting it out as loud as you can, for as long as you can.

Hitting a punch bag until you can't punch any more.

Breaking something, and then breaking the fragments, until the pieces are small enough to grind beneath your boot/shoe.

Slashing up cardboard boxes (pycho-style) with a big knife. ( This was a favourite of mine )

You can think about this and come up with your own ideas.