Unable to Export pdf's

Not able to export a graph as a pdf file, or even print the graph.

On the Andriod phone app, if you hold you finger on the reading you want, a check will show up next to the reading. In the upper right is a printer icon that will open the print view. You can then select save as printer by clicking the down arrow next to select printer.
On the PC app you need to print to a PDF.