entering more than 1 stock symbol

hi - I am 100 % sure this sounds very very stupid, but i have not been able to figure out how to enter into one chart more than one stock symbol so the charts
- show which stocks or ETF's are the strongest for any given - chosen time period ?

suggestions please, there does not seem to be a menu options and entering them into the usual data filed separated by coma does not seem to do the trick

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