Whenever you need to call a widget so that it displays on a web page, you are required to provide the short code which is formatted as such:
[widget=your widget name here]
How Can I Access This Short Code?
In order to access the short code version of your widgets, navigate to Toolbox » Widget Manager
For Customized Widgets, click "Edit":
For Default Widgets, click Actions --> View Master
On both scenarios, system will redirect you to the "Edit" view of the widget specified. Scroll down all the way and you will find the short code:
Copy the code on the left in order to call a widget on a web page.
Where to Paste This Short Code?
In order to call a widget on a web page, navigate to Content » Edit Web Pages » Click on "New Web Page" OR click on "Edit" on preferred existing page:
On this view, paste the short code that copied earlier to the section highlighted down below:
After clicked on "Save Web Page", your web page will be created on the fly and the respected widget will be called.