I m newbie.I don't want to ruin my board.I searched and found crysal soldering to launchpad.But there is msp430 launchpad pins too.Can I solder pins directly or should I use male header or female header.I said that pins like 1.6 1.7..... Can i solder them directly
The crystal location is placed there because it's a critical thing for a clock reference, as Leon said. Place the crystal at that location.
An alternative is, what I've seen very similar on some of the olimex microcontroller boards, is to use female pin headers at the location. You can slide a crystal in there and swap it with another one whenever necessary. However, this might not be the best and reliable connection, as it might not be a perfect fit (and make very poor contact).
Personally, if you want to use the board occasionally, take 1 crystal you think you'll use most often and place it right in there. I also believe the boards very sold for a very very low price, so you may as well get another one and place another crystal on there, if you're a bit anxious with desoldering and soldering.