Once you are done choosing your widget, you are going to click on add to your web page. Please note that which ever widget you choose, it's going to be different from others. I chose the recommended product links just to show you what one looks like.
With this widget, you have two choices. Either select a product line through the drop down box or enter key words, or you can select a subcategory. This is how you would add products to your widgets. Once you are done, click on continue. Once you are done, a page is going to pop up with your html code that you will copy and paste.
Before you go and put those codes on your website, you need to install a plugin first on your website. The name of the widget is Amazon Widgets Short code.
What is going to do, is add an amazon button on your edit page. You will see an amazon dropdown.
Once you have clicked on the name of the widget you designed, you will see a code at the end of your page in yellow.
What you are going to do is hit the text tab. At the end of the writing, Paste the code there. Once done, click on visual and update your page. Once done, Click on preview, You should see your widget on your page. It will look like this. I used the My Favorites widget.
If you were to add the astore itself, it would look like this
\
I hope this has helped. If you have any questions, please ask and I will try and help the best I can.