On all iOS's you need to edit the password in both the incoming and outgoing settings.

 

When you go into an email acocunt settings in iOS, you will see:

Incoming Server

Outgoing Server

Advanced Settings

 

This "Advanced Settings" is the Incoming advanced settings. The SMTP Advanced settings tends to hide itself....to get to the SMTP Advanced Settings, go the the SMTP Outgoing Server, click on the server in the list, then you will see the advanced SMTP settings.