How to lower the quality on my integrated HD Webcam for Skype? (limited data)?

I'm running Windows 8.1 on a laptop and have an integrated HD Webcam using the default software Lenovo EasyCam.
I need to find a way to lower the quality of my feed when I'm skyping due to a newly implemented data limit from my ISP, as it is currently using about 1mb/second, and would really like to avoid having to get an external webcam just to be able to lower from HD feed, anyone that can help please do so As soon as possible!