remote desktop port forwarding comcast business class

i recently had a network change and i have lost my ability to remote into my computer at home from elsewhere using ARD.

i'm more than certain that it is the port forwarding that is not set up correctly on my comcast business class modem. i do have a static IP.

I would really love some help with this. happy to provide any information necessary. please let me know what you need to know in order to guide me to the correct solution.

thanks!!