Click Print/PDF button at the top tool bar to print your tax return, then select "Microsoft Print to PDF" from the printer name list to print:

The following screen will pop up, choose a file name to save:

If there is no PDF printer installed, just download any PDF Converter from Internet and install it, such as PrimoPDF, etc. After the PDF driver is installed, print your tax return again. Select the PDF printer from the printer name list to print, finally choose a file name to save.