It's run by Yahoo, and I just set it up to show your RSI. I don't know if you have to log into Yahoo to use it, but Yahoo is free, so ...
I don't use it as I have something I use and pay annual fees (which are quite low).
Until you learn how to use this linked chart, you can at least change symbols in the upper left-hand corner.
FWIW, you can enter lists of stocks and create portfolios at Yahoo for free. When you use Yahoo to look at portfolios, small charts, news, etc.; just click on their small chart and that will load this bigger and interactive chart.
I cant guarantee you will see the chart, as it may only be available to those who have a Yahoo account. That is also free, so ...