As you know in Siberian CMS Editor, you can display the Support Link. But it's opening in the same window, so here is the trick to make it open in a new window.
Suppose your support link is https://example.com so you have to put this link like below format in your Siberian CMS Backoffice >> Settings >> Communication >> Support Link
https://example.com"
Now your Support Link will be opened in a new tab/window.