QRZ.com callsign lookup:

First set the path to your browser .exe using the {File} {Set path to Browser .exe} menus.
An easy way to find the .exe is to do properties on the browser shortcut.
Exit and re-start the logger to initialize and save the setting.

To lookup a callsign in the QRZ database:
1) Click a QSO in the log and do right-mouse click.
2) Or - click a QSO in the log and <Enter> `QRZ` in the callsign field.
3) Or - <Enter> `QRZcall` into the call field, where call is the lookup callsign.