No generator in-app?

W10 64-bit, newest avast (17.1.2286)

Why is it not possible to generate passwords when adding account for sites where it doesn’t detect fields properly.
Like for example when I try to change password on reddit.

http://i.imgur.com/yFkhFn9.png

https://www.avast.com/faq.php?article=AVKB254#idt_240

Sorry, but this does not help. since that popup the FAQ tells us about does not appear in situations like the one I mentioned.
I know I could go to some random website and fill in the fields in a registration page i know works, but why buy pizza to get pepperoni, when I just want the pepperoni?