Connect a Report to Workforce in Reporting Web Studio

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I would like to set up a connection to our Workforce cube to the Reporting Web Studio. Is there a way to change the connection on an existing report?

And where do I find the information to set up the new connection? I have gotten to the below screenshot, but don't know what I should be inputting here. I went to Tools/Connection, but there is nothing set up for the plan cube that I could use as an example. (There are reports that connect to the plan cube, I just don't know where to check that)