Hi Puneet,
You to import the modules from the Appstore while you are in the modeler.
Once you have done this they are available as module in your project.
Add the needed pages to your navigation and define the project security.
After that you should be able to continue.
All you need to do is run the Model Reflection, create an import template (which maps your Excel records to an Entity), upload the file you want to import and run the import.