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The way to set the classpath for a specific project is to use the javac and java commands' -cp option on the commandline. For Windows: (don't know filename separator for Mac)
javac -cp...

The selenium folder must be on the classpath so the compiler and java programs can find it. That's for class files.
If the class files are in jar files, the jar files must be on the classpath.

If you are getting error messages, please copy the full text and paste it here. Images are hard to read and copy contents from.

Where is the package you are referring to in the import statement? ...