Hi Matt123,
You can easily accomplish this by creating a new screen based off the UserSignInLog table. Add a Grid object to the screen then edit the grid to include the fields you want to see, e.g. UserName, SignInDate, SignInIPAddress, etc. Save & Close the screen then you can view it by hovering over the name of the screen and clicking the View button to the left of it.
To create and view screens go to Customize > Screens. For more info regarding the Screen Designer check out this document.
If you're new to customizing then you should also watch our Customization Webinars, in particular, the Introduction to the Customization Screen webinar will be helpful in this scenario. You may need to download and install the GoToMeeting video codec in order to watch some of the webinars. Hope this helps!
- Ashur