To set up using an iPhone:
https://help.one.com/hc/en-us/articles/115005586709-Setting-up-Mail-on-iPhone-iOS-11-12-
Following instructions to step #7 in the link above. Use the following information instead of the guide instructions once you reach this step:
Incoming/Outgoing Server Hostname
mail.assistedindependence.care
To note, in the Outgoing Settings it will say the username and password is optional during the setup. Disregard this and enter in the hostname, username (email address) and password anyways.
To set up using Mail OS X – Sierra:
https://help.one.com/hc/en-us/articles/115005594545-Setting-up-Mail-OS-X-Sierra
To set up using email in the Samsung app on Android:
https://help.one.com/hc/en-us/articles/115005586749-Setting-up-email-in-the-Samsung-app-on-Android