IIS manager on windows 7

I have install IIS on my windows 7 and did a web service tutorial for asp.net. The service does not run with out errors. I have searched for solutions to running my service and one of the solution is to add IIS_IUSR for the service using the IIS manager and give them persmission to access the file and service. I do not see any where in the IIS manager that lets me do that.

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