www.dreamviews.com Read everything on the site, it's all very useful. If you have problems after that, then come to the message board. Not trying to be mean, but it's apparent that you're not familiar with the basics.

In short...
It takes a lot of practice to be able to think to do a RC in a dream. If you have good dream recall already, then it's all about focussing on your goal before bed and during the day. Simple as that ( keeping a DJ too ). It seems slow and frustrating perhaps, but there's no trick, no shortcut. This information and a myriad of other useful tips are all on the main site.

Good luck!