Hi there -- Thanks for reaching out! The change that would need to be made (if necessary) is one completely outside of the settings in your Emma account. My understanding is that it is a change to your web site or web server encryption package that your web developer would make.
What we have learned is that many web developers proactively made this change to systems under their watch since Google did a pretty good job of sharing the news through appropriate channels.
Your end users won't need to change anything and shouldn't see any change as a result of this switch.