What have you done so far? Have you created custom OSC address pasterns in TouchOSC, things that correspond to the patterns that Renoise will understand?
I haven’t used TouchOSC in a while, and never on any Apple devices, so I don’t recall if the TouchOSC editor allows you to create address patterns that play nice with the default Renoise OSC handlers.
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Have you looked at https://forum.renoise.com/t/renoise-ultimate-touchosc-ipad-template/34127 ?
xRules might also make things easier.