Can you please show what arrrows you have drawn that the system doesn't accept? Forum rules.
To answer your 2nd question, yes the enantiomer would be the Rs and OH switching "arrows*"- but that is only one part that has changed in the molecule. Look up the definition of an enantiomer, it should be "one of two stereoisomers that are mirror images of each other that are non-superposable"(from Wikipedia). So are they mirror images?
*And I think you call the arrows "wedged" if the bond is solid and pointing out of the page, "dashed" if it is a dotted line pointing out of the page. That should be the correct terminology. Arrows are usually for reactions and movement of electrons.