You'll see your certificate when you finish your course, and you can grab it to download or print again at any time. Here's how:
 

Step 1: 

Sign in to your account here.

Step 2: 

Once you've logged in, on your main page, click on "My courses" in the top right. 

 Step 3: 

This page shows all of your courses, click the drop down menu and select "Completed"

Step 4: 

Find your course, and click on "View certificate"

Step 5: 

Select "DOWNLOAD" or "PRINT" at the top of your screen.
 

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