How to take th flight plan made on the MFS GUI and import it on FMC of PMDG 737

Hello everyone, I absolutely love it! Great sim! The planning tool we see when selecting a departure airport is very easy to use. Select runway, select SID, destination airport, STAR etc. But when the PMDG 737 plane starts, I go to FMC and click on Plan Request nothing happens. Am I missing something? Thank you.

You need to use Simbrief by Navigraph and create a flplan and export the plan for PMDG aircraft. Then you can import it into your fmc.