Do not show cached version to crawlers

Hello! First of all thank you for the best caching plugin ever, I really enjoy it!
I am not very familiar with advanced settings so I decided to ask experts for help.
Can you please tell me how not to show cached version to search engine crawlers? In Yandex webmaster tools I noticed that bot crawled few cached pages of my site and urls are set to cache files urls like wp-content/cache/***/index.html. So I want to exclude Yandex bots from showing cache. Also I think would be good to exclude Google crawler just in case.
As I undertand this can be done by adding Yandex and Google bots user agents in plugin settings, but I am not sure how to do that properly.