First of all, type the following in a terminal:
This should give you the UUIDs of all your partitions.
Once you have the UUIDs you need, editing your fstab is not actually that hard. You need to enter information into 6 columns, each separated by some white space.
For the first column, add the UUID of the partition you want to mount (which you obtained from the blkid command).
In the second column, enter where you would like to mount the partition. I usually place all my extra hard disks in /mnt/extdisk1 /mnt/extdisk2 etc.... Note that you will need to create the above directories using
sudo mkdir /mnt/extdisk1 etc...
For the third column, enter the type of file system the partition uses (ntfs, ext3, etc...)
For the fourth column, enter the options you would like to use. I would just specify
defaults. If you have an ssd, its good to also put
noatime nodiratime discard. Discard enables TRIM support for your SSD - ensuring longer life.
For the fifth column just enter 0
For the last column, enter the pass value you would like to give it. This is a number specifying in which order you would like to mount the partition (just make it sequential and you'll be fine).
If you want more information you can take a look at the Arch Wiki for fstab.