Yonke imikhiqizo Isithangami Sokwesekwa

I have version 102.11.0

I am trying to add email addresses to my contacts folder from the email header. I right click on the address and a box opens up that says "add cardbook contact" and I choose the address book I want the address added to.

Then a full screen opens up for the contact - at the top it says "register a new email address"

(It sure would be nice if all the language was the same. Is this a cardbook? an address book? Am I adding a contact or registering an email address? What does "register" mean? All of this variety only adds confusion.)

That screen has the email address and contact name entered in the proper fields - I scroll down, look all around, but nowhere can I find a "save," "done" "ok" or other button to click. And sure enough, when I close the screen, no contact has been added that I can find.

I would really like to be able to add contacts this way - otherwise I have to copy and paste, etc. etc.

Can anyone help? I'm on Linux Mint 21.1 Cinnamon

When Cardbook is enabled, the search (CTRL+K) lists results, but when I click on any individual search result there is just a blank tab. It works fine if Cardbook is disabled.