Mining Bitcoin with a graphics card is really a waste of time, especially on a Mac which probably has a really old GPU.
I hate people like you why even post anything just move on and post nothing dont waste his and your time.
The answer he was looking for is
...snip...
What coin do you wish to mine?
Mining Bitcoin with a GPU is a waste of time. If the OP was just wanting to tinker around at a loss for an education that would be different, and I assume he would have posted again saying so.
If he is looking to mine alt coins then he is posting in the wrong section. Which means your post is also inappropriate. Alt coin discussions should be taken to the alt coin section.
But we don't know if he is looking to mine Bitcoin or Alt coins because he never cared to post again.