How to use parts created by others

Hi all
I am all new to the scene and creating my own projects etc, what I am struggling with is there is a part I have found and want to download and use it on my project but I am struggling to find the best way to save and use it as when I save it into the parts file nothing shows up, if someone could gibe me a step by step guide would be brilliant :slight_smile:thank you

please ignore I found it sorry :frowning: