Once logged into Mailfire, click on the lists tab.
Once you are on the Lists Home page, hover over the menu button on the right-hand side, and select ‘Upload Bulk Subscribers’.
This should then take you to the Add/Remove Subscribers page.
You will then select the option that you want, e.g. Create New Subscribers, and choose an appropriate action, e.g. Add My Imported Subscribers to an Existing Message List.
Now click on Upload, and you should see a progress bar showing the progress of the mailing list being uploaded.
Once this has finished, there will be a report showing the user how many subscribers were added, updated, or invalid.

When navigating back to the Lists Home page, you should now see the subscribers added to the mailing list, which are displayed on the right-hand side of the page.
Individual subscribers may be created by hovering over the menu button on the left-hand side of the screen, clicking on the Create New Subscriber option, and filling in the relevant information on the page that displays.
Once subscribers are uploaded to Mailfire, they are sorted in alphabetical order, so even though they show up under the same letter, this does not mean that they are assigned to the same mailing list.