When creating posts, you’ll sometimes want to mention other users. Each network has its own specifications, and some won’t allow tagging users together, for example, you won’t be able to tag someone on Twitter and Facebook at the same time.
To do this, we recommend using the Customize for Each Network button.
Facebook, Twitter, LinkedIn
Simply switch to respective tab and search for the user by starting to type with '@' followed by the name/username. You will be able to tag people and pages via a dropdown.
Instagram does not allow third-party apps like Statusbrew to tag individuals or businesses.
Although if you type a username (eg. @statusbrew) in the text field for Instagram, it will hyperlink to that profile in your published post caption.