Arduino Tutorial 2: Install Arduino Library
Steps to Install Arduino Library:
1- Download library file. Normally library files are in the form of .zip or .rar.
2- Extract the folder from the ZIP / RAR file and paste it into the directory where you installed the Arduino IDE software. Examples are shown below, library folder named DHT is pasted into directory C:\Program Files (x86)\Arduino\libraries.
3- Make sure the file you paste is in the form of FOLDER, not ZIP or RAR. Otherwise the software won’t be able to trace the library file