The add-on general settings are added on the same page where Uni CPO's general settings are:
They are pretty self-explanatory. Some of them are for modal window where a user saves its product configuration.
Make sure this setting "Enable a possibility to create custom URLs for any customers" is checked if you want to let customers to save their configurations!
Some other settings for email template and the rest are for PDF template. These are mostly styling settings, so just add text/logo and check how it looks like. There is no right or wrong, try and use what works for you. 😉