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To make the "Interfaces" option appear, first go to "Boundary Conditions". Select the first Zone on the list, "blade_bot_in" and change the type to "Interface". Click OK the popped window to keep the default name.

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Note that "Mesh Interfaces" option appear on the main menu to the left.

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In the first box, "Mesh Interface", write "blade_bot". That's the name of the interface. No select as Interface Zone 1, blade_bot_in. For Interface Zone 2 select blade_bot_outer. Click "Create". The window will not close by it self, go ahead and close it.

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Repeat this and create the remaining 3 interface zones.

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By the end of this step, you window should look like this.

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Set Solver informations

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Lastly, click in "Units" and change the "angular-velocity" unit to rpm.

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Set the Model

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Highlight "Model" and double click the third item in the list, "Viscous - Laminar". Select "k-epsilon (2 eqn)". Change "k-epsilon Model" to Realizable. Retain the rest as default. Click Ok.

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Materials

ADD MATCH CONTROL TO MESH? (see wind blade tutorial) 
Import mesh as a wbpz file instead o msh? 

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To explain a little bit about the MFR method, see Numerical Results part, where I wrote something very short.

General: leave p-based

Units: set to rpm

Models:viscous k-eps turb. Realizable

materials leave default. check density of xxx and visc of...

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