how do you activate them??
i can only do the 3rd eye
The same way as you activate your third eye. For some people it just takes more effort, and time.
Do a search on it in the forums and on Google, there are a lot of techniques out there.
Take a look at NEW (http://www.astraldynamics.com/tutorials/?BoardID=18).
There is currently an active thread about chakra activation here (http://www.astralpulse.com/forums/viewtopic.php?t=18110).
Also, you may find my chakra meditation (http://www.astralpulse.com/forums/viewtopic.php?t=17957) useful.
Good luck
Alex