Thank you for participating in the Answers Forum. I see, getting an error message saying your browser or system isn't supported/compatible with the your Slingbox. So, we can determine what may be causing your issue.
The more details and information you can provide, the better we (the forum community and Sling Media) can help.
Which device are you getting the error message from?
What Version and model is the device your using to access your Slingapp?
What Slingbox model do you have?
How do you have equipment setup?
Sling Media Support