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Before you can begin to create visual effects using Niagara you will need to enable it via the Plugins menu. In the following How - to we go over what needs to be done in your UE4 project so that you can use Niagara.
Steps
First we need to open the Plugins menu by going to Edit > Plugins.
In the Plugins menu, locate the FX section and then under Niagara, and Niagara Extras, click to check the box for Enabled.
Now press the Restart Now button to restart the Unreal Engine 4 (UE4) Editor with the Niagara plugin enabled.
End Result
Once the UE4 Editor has re-started, when you right - click in the Content Browser you will have a new FX section that will have all of the various items you can use with Niagara.