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Once you are there you can see different stats, like pips earnings, number of trades, win%, number of weeks, average trade time, max. drawdown percentage, number of followers, roi or amount following.
Then to search for best signal providers that suit you just sort this ranking with any indicator you wish.
So if you wish to find out best providers according to their ROI (return on investment) just click on ROI and you are done.
Just note, that there are more to be consider than just ROI. Read more about Necessary Minimum Equity or How To Compare Signal Providers.