This is a very self explanatory add-on. It simply records the logins and allows you to view the histories in the admin area.
You will find uID, Date/Time, IP, and User Agent on top of the table.
By clicking uID, you can sort the histories ordering by uID. Another click will reverse the ordering. Same for Date/Time, IP, and User Agent.
You can optionally set the start date, the end date, and the users, which allows you to filter the login histories.
You can enter the start date and the end date via GUI, with the aid of jQuery DateTime (http://xdsoft.net/jqplugins/datetimepicker/)