There are a couple configurations you will need to make to use Chartio with a local SQL Server.
Forward traffic from our external IP, 188.8.131.52, on port 1433 to the internal IP address of your desktop computer.
Allow access to SQL Server via the Windows firewall. More information about configuring the Windows firewall can be found here.
If you have an IT person or a network administrator, they will know how to do this for you.