So ...

Go to Appearance => Widgets, and drag the default Wordpress text widget into your sidebar widget area.

Next, you'll have to select the "Text" editor tab (!) and paste the Javascript code inside it:

Finally, click the "Save" button to save your widget settings.

And that's it! Congrats! You can now visit your website to see your newly added AWeber email signup form in action.

Here's the live result in my case:

Cool, isn't it? And it's really not rocket science :)

And that's it my friends!

If you have any comments, further questions or update requests please don't hesitate to react! Like, comment and share!

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Thanks for your time!