please tell me step by step method to activate rtl in my theme?

Hi,

First you should localize your WordPress: http://codex.wordpress.org/WordPress_in_Your_Language
Install WordPress in your language then automatically the theme will use the rtl.
Search the forum for suggestion and fixes for the issue you may encounter with this and you should also consider that unfortunately we recently have decided that starting with the next theme update we will not include rtl support within the theme. You can still use the theme as it id but unfortunately you cannot updated it as you will lose the rtl support.

Sorry for the inconvenience!
Thanks for the message and for understanding!