When you first open the OLLY application, you will see the Login Screen with only one default user shown. Just click <Log in> to get started.
In the “Admin” section of OLLY, you may change the default user name to your own name. You can add an image icon for yourself by clicking on the top right triangle and selecting “Set icon.” Choose an image file from your computer and select “open.” This image will now appear on the Login screen for your user name.
You can then repeat this for every new user you add to OLLY, so that your Login Screen might end up looking something like this: