Hello, my name is Marco and I am an Independent Advisor. I will do my best to help you.
There are several free proxy services out there, so which one are you talking about?
To find out if you have a new ip, you can go to https://www.myip.com/ if your ip has changed. If so, the vpn is working.
Personally, I find the free proxy server unreliable, slow, and a lot of advertising. If you want to make frequent use of it, you are better off with a paid service, like nordvpn.
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.