Hi @Welshdog
Welcome to the Enpass community!
The autofill works when you double click the Icon on the Enpass extension. When on the webpage, to the right side of the address bar, click on the Enpass extension. It will show you all the relevant items for that webpage. Double click on the item you wish to use .
If there are any websites on which the autofilling is not working for you, please let me know.