Wireless Security

I want to put some security on my point to point Link.

I have a ap-bridge and a station connecting to it, can someone help me to protect
these two routers.

I have looked at static-keys but i am not succesfull

Please help me

what type of security are you wanting to use?

Use WPA or WPA2, as WEP is not secure enough,
http://www.mikrotik.com/testdocs/ros/2.9/interface/wireless_content.php#4.13.21.7