How to adjust stock info in Yahoo portfolios after split?

I had 511.3 shares of BTU at original cost of $11.40. There was a reverse split, so now I have 34 shares. How do I adjust my cost basis to accurately reflect my losses?

Submitted October 05, 2015 at 09:15PM by jakeblues68 http://ift.tt/1QVwQe7