Checkout license

I need to check out a license.  I am using the Bentley Licensing Tool.  I see the word "checkout" in the tab in in the "checkout License" pane.  When I tried to search for instructions on how to check out a license I put "checkout" in the search bar.  This came up blank.  How about putting the #checkout on the checkout document as a tag so it can be found by the search engine?

Where is the document with instructions how to checkout a license?