Adding Custom Field

Greets:
I am slowly learning how to use the Newsletter plugin. I have set up the plugin, successfully have an email sent to me via the great setup wizard, and managed to send a test newsletter to myself to make sure I was ale to do so.

I was looking at the fields of a subscriber, me in this case, and I did see first and last name and so on, I’m wondering if it’s possible to add a “company” field. I was looking at the blank fields on another tab, but could not get my head wrapped around whether it’s possible.

Also, I’ve yet to learn how to use the Composer to craft a custom template, so will watch the videos later on. But I take it that working through it isn’t possible with dark mode? I did see a sidebar to the left of the screen in the Composer, but it was blacked out mostly so could not see the choices.

Thank you!

The page I need help with: [log in to see the link]