The toolbox you are using is the one available for the creation of email campaigns. You will be able to see your widget when you create an issue.
If you want the user to be visible in the page editor, you need to register it in the page controls toolboxes section. Please refer to our documentation
for further reference.
Additionally, you can use Sitefinity Thunder to ease the process to several clicks. For more information click here
Ivan D. Dimitrov
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items