Hey, First of all, welcome to Game Development especially using Unity! We hope you will have a great time developing awesome games!
Secondly, using our shader assets is pretty easy..... just make sure your project is using URP, then just drop our shader material to any of the sprites you want to act as a distortion effect. That's all. The settings to tweak the effect can be found on the shader itself to get the right feel.
Hope this helps.