If you wish to implement spry validation in your form, you will simply add a spry validation form element.
Go to Insert -> Spry -> Spry validation Text Field to add a spry form element.
as for the Captcha validation, you need to apply that validation to the forms action page. In my reply to the other thread I gave a description on how to accomplish this:
this can be used to import form dynamic bindings from the form page to the forms action page enabling you to add the server validation to the action page if it is a different page from the form itself.
you could open you form processing page, then go to the bindings panel, click the plus button and select Form Data. in the form data window, click the folder icon and select the form page.
"Also you made no comment on the important omission, in the tutorials and utube video."
In my reply to the other thread, i tried to direct you to the proper place to address your documentation concerns:
All documentation feedback should be directed directly to the documentation team.