I am very happy that this was helpful!
Yes indeed the "old"documentation can be confusing especially for new Wappler users.
About the missing “save button” I am not sure why you don’t see it, and actually I don’t have access to my wappler so I can’t send you a screen shot…
For the “Handler” to DMXzone Server Connect” you simply go to the “Properties panel” (right side window of Wappler at the bottom you will see Properties) look for something like )“Select Action file” the action you created earlier will appear, just click on it.
Note: Don’t forget to select “POST” as the “Method” this is the step just before selecting your action file…
About the reCaptcha: I don’t remember about a specific documentation for it, but there is a post that will help you with important stuff on how to use/configure it : Can captcha be used with wappler?
Hope this is of any help 