Getting your own YouTube API key
By default, every YouTube Gallery widget comes with a generic YouTube API key, so you don't need to add any for the widget to work.
However, if you'd like to use your own API Key, here's a step-by-step instruction showing how you can create one.
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Go to https://developers.google.com and login or create an account, if necessary.
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Next, go to https://console.developers.google.com/project and click on Create Project:
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You'll be redirected to the page where you need to fill in the project information and click Create:
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After creating your project, please go to Google API Library, select your project, find YouTube Data API v3 in the list and click on it:
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Click Enable:
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Click Create Credentials:
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Fill in the fields and click Next:
Congratulations! You've got your YouTube API key! 
To add your own API Key to the widget, go to the Advanced tab of your widget's settings:
Well done! Now you know how to create your very own YouTube API Key!