There are two parts to the project.
One is the client app files that gets generated according to the Client Deployment tab. For this, you would want to save it in .ZIP format and provide it to your network admin to transfer to the IIS. It is simply a file copy for this step. https://docs.appeon.com/ps2021/Package_the_client_app.html
Second step is C# Web API source code generated according to the Web API tab. This source code you would compile in any C# IDE. I recommend simplify your life just use SnapDevelop that is included with PB. You would use the File Deploy option, which compiles the code and saves to disk. https://docs.appeon.com/snapdevelop2021/Publish/index.html#publishing-to-a-local-folder
That compiled code would be then deployed to IIS according to this tutorial: https://docs.appeon.com/ps2021/Hosting_Web_APIs_in_IIS.html
One thing to keep in mind that the Web API URL configured in Web API tab needs to match where really the Web API will be deployed. If you want to change this after the fact, follow these instructions: https://docs.appeon.com/ps2021/Change_Web_API_URL.html
Probably good idea to read all the PowerServer docs, then ask specific questions or report specific issues. https://docs.appeon.com