# IIS user permission
Follow this instruction to give the IIS application pool user read and write permission in a folder
Right-click on the folder where the application pool user should have permission. Choose *Properties* and tab *Security*, click *Edit* and then *Add*.
Enter IIS APPPOOL\\*"the name of the Novacura Flow server application pool"* in the object name field.
Click on *Locations* and mark the local machine in the tree structure and click OK.
Click on *Check Names*, if the user name is correct and exists it will be underlined and change to just the user name, and click OK.
Mark the added *Novacura Flow server application pool user* and check *Write* and *Read* permission, click OK.\
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Now have the *Novacura Flow server application pool user* permission to Read and Write in the folder.
