Bugs or feature requests can be reported in the issue tracker. Here you can also watch and vote for request made by others users.
The Brewfather user group is a great place for this: Brewfather Facebook Group.
Yes, log out of Brewfather and go to the login screen, write in your email in the email field, and click the "forgot your password?" link. You will then get an email to set your password. After you have set your password you can log in with that email and password combination. If you want to change the email-address tied to you account you can do so in the manage account page found by clicking your portrait/email/name in the menu.
Easy! Just change batch size or efficiency in your equipment profile within a recipe, click save and it will ask you if you want to scale the recipe to match the new numbers. Also - if you change to another equipment profile it will scale to match it also!
Check out this video (turn on subtitles).
Basically you export a BeerXML on your phone and open it directly in the GF Connect app. On your batch click the menu button in the lower right, click export, select BeerXML, the file will show and you should get an option to open the file in your GF Connect app.
Then you just start brewing!
See the Tilt Hydrometer page for setup instructions.
See the iSpindel page for setup instructions.
See the Brewpiless page for setup instructions
Brewfather is available as a progressive web application that can be used on any device (Easily add it to your home screen from your mobile device without having to install anything). Brewfather has full offline support and is cached on your device/browser the first time you load it.
Brewfather is also available as an iOS app here. This is the recommended way to use the app on an iPhone or iPad.