If you'd like to have a link to sign up for a mailing list that you can include in social media posts (Facebook, Twitter, etc.), emails, on your website, etc., you can create a Form in Active Campaign for this.
First you would set up the mailing list as a list in Active Campaign, then you would create the form. Once the form is created, you can generate a link to the form to be able to embed it elsewhere.
Note: the functionality described here depends on your having an active account with Active Campaign, a third party system that integrates with your Cerbo EHR. Please see here for more information about our integration with Active Campaign.