To import a process template you must first download a process template. 

To download a process template navigate to Setup.

Choose the process whose template you want to download. 

Click the Download button. This will download an .xml file. It's best just to save the file to your desktop. 

Now, navigate by clicking the up arrow back to the Setup page. Click Import a process. 

Enter the name of the Process, chose a Group, and click Next. 

Choose the process template you want to import (likely the one you just downloaded) and click Next. 

Verify the template you want to import by clicking Finish. 

The imported template is now ready to be used.