I have a db. How to add fields to an already created record? And how then to display the contents of the fields on the site? Give me a code?

Question

MySQL

Here you can see my login, password, email. And the product field. I created it and filled it out when registering this user, that is, when you enter EVERYTHING at a time. But I need a way if I have already registered and then separately add something in the product field.
And I also want to know how to display the contents of this field on the site. That is, access a specific record in the database, and take the text of a specific field ...
(The database is organized through RedBean)

Answer 1

But I need a way if I have already registered and then separately add something in the product field.

SELECT
Read books or something.
What does the documentation for the tool you are using say?