You are lost on the internet. The QB Community is at this other link:

https://quickbooks.intuit.com/community

Desktop payroll is a Windows function. QB for Mac runs payroll over the web. QB for Windows would only run on iOS if you are running Windows as a simulation.

You can submit payroll up to 45 days in advance. You can submit them now, if you know what they are for values, for the later settlement dates.