Can we have a spry validation video tutorial on how to add or remove it... please?

I often need to add or remove fields for validation on forms that have been created by data assist or form builder. The validation I try to add or remove never seems to work, so I often end up going back to data assist or form builder and starting again from a preset that I saved for one particular job. If I've done a lot of work on the page after the initial running of the extension, then I loose all that work. I often save a copy of a page to revert back to should I have trouble, and I think every time I have tried, I have had to revert!

You have a video showing how to add a new field, but could we also have a video showing how to add validation to new / existing form items, or how to remove validation no longer needed?

Thanks