Got the “Prohibitory Symbol”

Went through the steps based on suggestions:

Command R @ Startup

1) Would not let me “Reinstall OS X” (OS X El Capitan) because there were no disk options on the ‘Select Disk To Install’ page.

2) Went back to Disk Utility and saw that “Internal Apple HDD” did not have a partition. Per a suggestion I created a partition and now I cannot go back and ‘mount’ it or ‘rename’ it. I’ve tried going in from the menu at the top and the drop down at the top of the page. I cannot completely delete it to start over. I don’t want to do anything else until I get guidance.

Thanks...