This article will show you how to import Subscribers for the Alert Center.
Who can use this feature?
System Administrator | Owner
Instructions
Click Modules, then Content, then Alert Center:

Select the category you would like to import subscribers to:

Select the Go to Subscribers button:

Select the Import Subscriptions button:

Select Choose File to import your file of subscribers:

Skip Confirmation Process: Check the box to certify that the users have manually confirmed to receive notifications for this list
Important Note:
Subscribers are required to confirm their subscription before receiving notifications. Failure to comply with this regulation could result in loss of ability to send any notification through your website, or fines to your organization. If imported subscribers have already confirmed their request to receive your notifications, you may automatically confirm them by selecting the checkbox.
File Format: The file must be a text file with a file name extension of .TXT or .CSV
Format Rules:
Fields must be comma-delimited or tab-delimited
Each subscriber record must be on a separate line
All three fields must be included for every record, even if one field is blank
Only the SMS Number field may be left empty
Blank lines are allowed and are ignored during import
Duplicate entries are ignored
Fields (In Order):
Email Address: Limited to 255 characters
SMS Number: Should be empty, or in formats ########## or ###-###-####
Subscription Type: Limited to values of Email, SMS, or Both
Notes:
New subscribers receive HTML email notifications
Existing subscribers keep their current notification format preference
Existing subscriptions are not removed during the import
File Sample:
brian@example.org, 555-555-0110, both
mari@example.org, 555-555-0112, sms
sundeep@example.org, 555-555-0115, email
chris@example.org, email
akila@example.org, 555-555-0117, both
Select the file you want to import. Click the Open button:

Click the Import File button:

View the import summary:

View the list of imported subscribers:

Note:
The list of subscribers is available immediately only if you selected the Skip Confirmation Process box during the import process.