For things that dont change very much you can add them to the config directory...
you can make your own array in the config folder in app OR make your own file there.
then you can use the config helper config('app.the_settings_array.item') as normal.
Otherwise, you can create a settings table in the database (so you can edit things)
For use settings that relate to the app I make a table user_settings and then when a user is created I automatically add a settings row for them with defaults.