If I follow correctly, I think there are two things you are working on here:
- Getting the camera streams into Blue Iris
- Getting the camera streams from Blue Iris into your SharpTools.io dashboard
Cameras into Blue Iris
Regarding getting the camera streams into Blue Iris, do I understand correctly that you already have four of your cameras in Blue Iris and working as expected and you are still trying to get one camera integrated into Blue Iris? If so, let’s work on getting one of the currently working cameras from Blue Iris into SharpTools first. 
Blue Iris Camera into SharpTools
Regarding getting the camera streams from Blue Iris into your SharpTools.io dashboard… have you tried opening the URL format James mentioned directly in your browser? You’ll need to be on the same network as your Blue Iris server (and not have any Firewalls on the BI machine blocking things). You should see a live camera stream if it’s the correct format.
For example, if I open up my camera with the short name of FrontYard in my browser, I would see:
http://192.168.1.11:81/mjpg/FrontYard
In order to use the camera in SharpTools.io, you’ll want to make sure your Blue Iris Web Server setting around authentication allows direct access to local streams. See the following post for more details: