Once we have created the ext2 file system, it is ready for use. All we have to do to be able to access it (as in reading from and writing date to it) is mounting it. If you mount it under /mnt/hda5, you can access this partition by going to the /mnt/hda5 directory and then do whatever you need to do. This document will assume that you have mounted the partition on a subdirectory under /mnt. It doesn't matter which subdirectory you choose (or you can use just the /mnt directory as the mounting point), but a good practice is to create a directory with the same name as the partition's designation. In my case the LFS partition is called hda5 and therefore I mount it on /mnt/hda5
Create the /mnt directory if it doesn't exist yet
Create the /mnt/xxx directory where xxx is to be replaced by your LFS partition's designation.
Mount the LFS partition by running: mount /dev/xxx /mnt/xxx and replace xxx by your LFS partition's designation.
This directory (/mnt/xxx) is the $LFS you have read about earlier. So if you read somewhere to "cp inittab $LFS/etc" you actually will type "cp inittab /mnt/xxx/etc" where xxx is replaced by your partition's designation.