Okay, let's do this the more transparent way. First, you have to find out, how the system has called the partition, you put your /home on. so type into your console:
there you will see various folders, carrying strange names like "sda1" "sdb1" or something. now just klick through the folders until you find the one with your old /home on it.
Then you have to tell your system that it should mount (which means integrate into the system) this partition on /home.
This information is stored in "/etc/fstab" -a simple text dokument- open it with
don't expect to understand too much from what is written in this file... just search the name of the partition ("sda1" or something) you looked up above. The entrie looks something like that:
sudo kedit /etc/fstab
now change this entrie like this:
UUID=a1954ad6-6653-43cd-9f20-5a8bdaea03b1 /media/sdb1 ext3 relatime 0 2
to get these changes to work, do a reboot. Now you will have got back your old home directory.
UUID=a1954ad6-6653-43cd-9f20-5a8bdaea03b1 /home ext3 relatime 0 2