Nine configurable actions are available for insertion of special characters into the vocabulary. Select one of the actions in the list and then click the Character... button to select a character for that action. A larger preview of the current character is displayed.

Changing the keyboard shortcut associated with each action can be done by selecting Settings → Configure Shortcuts....

Select Defaults to restore all settings to predefined defaults. Select Apply to make your changes without closing the dialog. Select OK to make your changes and close the dialog. Select Cancel to close the dialog without making any changes.