This is a test of commonsense. Complete the next sentence:

How to easily add references to wikipedia using proveit
Create an account on wikipedia and go to your user' preferences '
Select the' gadgets' tab.
This tab has different add-on features which are used to make editing work easier for users.
Check' proveit'.
This will enable a user script that makes it easy to find, edit, add, and cite references in wikipedia articles. Save settings through the button at the bottom of the preferences page.