Convert EPUB to MOBI when sending to Fire?

Hi there. I'm setting up my system on a different computer. I can't figure out how I set it up before. I had it so that when my Kindle Fire with Calibre Companion was 'attached,' if I clicked the "Send to Device" button on the toolbar, then a list of file types would pop up. For PDFs, I just click the button to "send as PDF," but for EPUB files I could select "send as MOBI." Calibre would then convert the EPUB to a MOBI and send the mobi to CC all in one go.

Does that make sense? Any idea how I set it up last time??