How to implement an attack animation using mouse

here is my issue. When I attempt to add the attack animation, i am never successful.

I have watched this video almost 20 times now.

and I cannot find a solution.

Taking logic into account, i cannot use the Animation State Machines ‘branches’, to include my ‘attack’ animation. Therefore I am to assume, as i have done in the event graph which is create a simple jump blueprint, that i must also create an attack blueprint. However, I have no idea how to do this.

Here are my current blueprints. I have added the attack animation to the state machine and have attempted to make the attack blueprint in the event graph.