Working, but wasn't easy
It's OK thanks Jason, I got the page working using the standard "Security Assist email password bahaviour" ... after 6 hours of non stop fiddling about.
In testing your Universal Email solution your typo from/form in your reply "Set it to filter the emailAddress column on the emailAddress from element" threw me for a good while.
Back to the SA solution, I followed the solution recipie many times, encountered many errors, uninstalled eCart to correct a Javascript error trying to use the Cookies Toolkit, found and downloaded WA_RandomPassword.php and WA_SHA1Encryption.php by Googling the files and finding them as zip file attached to replies in other forum threads. In short, not an "easy solution" to use the first time, but now I've cracked it I will be confident to use it again.
I do think that the documentation could be improved. Most of what is needed is there, but lightweight and dispersed. The videos are especially irritating as the key info is gone in a blink, while the printable files lack depth in general. I'd like to see one single PDF for each product that I can print and study and make notes on, and that explains slowly, carefully, what needs to be done.
Again: great products, but the learning cure, even for a seasoned programmer like me, is very steep. The productivity improvements I am expecting by using the WA tools is yet to come, but I am sure it will.
Thanks for your help.