change the battery in the remote key fob, then, when you have done thatm, take some time out to read the manual, which explains this and many other things too.
the bleeping is merely a warning, and the fob may go on for ages, as per howardo. It may not though. take your chances.
if you don't have a manual, please go to greenoval.com and download something called "Rave CD" which is free, and will have a complete user manual and workshop manual for you freelander.
good luck and welcome to the forum