How do you use Magic Sheets in iRFR on the iPad?

How do you use Magic Sheets in iRFR on the iPad?  


I have created a magic sheet on Nomad to control improvised show. On the iPad I open iRFR and connect to Console but when I click on the DS tab - Target selection and select Magic Sheet the first button is a different colour, but taping it doesn't seem to do anything? How can I open the magic sheet?

Sorry if I'm missing something obvious.

The Groups and Macros DS seem to work ok. 
I have iRFR ver 3.0.1.1 running on iPad connecting to Nomad. I saw a post from a couple of years ago but nothing more recent. Thanks

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