Preferences
Lighthouse Keeper has 4 sections to its preferences:
General
The general preferences section provides an option for choosing how often Lighthouse Keeper should automatically check for updates, as well as a field to set a hotkey to bring up the add ticket window from anywhere on your computer.

Appearance
The apperance section allows you to update various UI settings such as the font size for the ticket list and details view, as well as the ordering of comments in the ticket details view.
Accounts
The accounts section lets you managed the accounts you want to work with in Lighthouse. To add an account, click the + button in the bottom left of the window. Then enter the account name and your username and password. Lighthouse Keeper will then try to check these details are correct.
Update (Website version only)
The updates sections contains settings for enabling automatic update checking and choosing whether you only want to be informed of full release versions, or also be informed of beta versions (i.e. version that contain newer features but aren't fully tested yet and so more buggy).