How to use default WP form elements to interact with custom DB table?

For style and code reference about the default WordPress interface elements, I use the plugin WordPress Admin Style, by Frank Bültge.

It shows CSS ID’s and classes, and screenshots, for the following elements:

Columns, Headers, Icons, Buttons, Tables, Admin Notices, Alternative Colours, Pagination, Form elements, Tabs

Full plugin page screenshot at GitHub.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)