In the old Azure Portal, I used to download the publish profile (which included FTP username/password) for App Services using the menu shown here.
How do I get this
it is right on the website`s blade.
and regarding to FTP address and username, you should be able to see the details from setting --> properties
I found it just in the main menu under Overview. Yeah, hidden firstly so you need to click ...More.
In the new portal, Goto
Azure Portal -> Your web app -> Overview Tab
Just Here "Get Publish Profile"
It can be found in App Service as follows
Click here to see the Download Publish Profile link
Thank you