I' ve plotted a polynomial graph with R Square value in Excel. How do I find the significance value?

I've plotted a polynomial graph in Excel. I added the stats box which shows the R Squared value for the data. How do I find the significance value for this R Squared value?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).