From within a terminal as root:

mount -t ntfs /dev/yourdevice /mountpoint

You can identify 'yourdevice' with:

fdisk -l

See the sizes of the drives and then corresponding name in that info, like /dev/sda, /dev/hda and put that instead of the above 'yourdevice'.(maybe you also need the specify the partition with /dev/sda1, /dev/hda2 etc.)

A mountpoint is just a directory on the system, you can take any.

The "-t ntfs" is just to specify the filesystem type.(for ext3 filesystem you should use "-t ext3")

This also depends on whether you are mounting an NTFS filesystem located on your system, or one over the network.

For network, use:

mount -t cifs //ntfs/share /mount/point

you will also have to include username and password if required by the remote system.

Depending on your distro, there are also GUI based ntfs-3g wrappers that can help in the process.

Remote ?
For example use a command like this:

mount -t cifs //fileserver/yourremotestorage /mnt/where.you.want.it.locally -o noauto,user,sync,username=youruser,password=yourpasswd,uid=ntuseryouneed,gid=ntgroupyouneed,dir_mode=0775,file_mode=077