I add two chart in one window . for example main chart is EUR-USD then I add an instrument AUD-CHF . these two charts are in one window to compare them. but I need to add RSI for these two pairs but just the RSI of one pair (for example EUR-USD) will appear in that window .I want RSI for two currencies in one window. Is it possible?
Yes u can! Please follow to https://www.dukascopy.com/jstore/ , find in indicator section "RSI Correlation" ! It has ability to use a multi-instrument option.