Add VBO checkbox to send Bulk emails in Admin
This is how you do it:


Go to Structure > Views and locate the Test Event view.
Click the Edit button.
Find the Fields display and click the Add button.





Filter the available fields by Bulk Operations and select a field you need, e.g. Bulk Operations: User.





Now the settings for this field show up. Scroll down to Selected Bulk Operations and select Send Email.





Click Apply.
Don't forget to save your view.
Now you should have a checkbox and you can select Send Email from a drop down menu.


I'd personaly would not use the VBO field but the Views Send module which is a bit easier to use. If you have the Views Send module, add the field Global: Send Email instead of the VBO field and proceed as described above.