The fstab file is a system configuration file that contains information about the filesystems that are mounted on your system. It is located at `/etc/fstab`.

The line you need to add to the fstab file is:

```
/dev/mapper/ssd-swap-swap swap swap defaults 0 0
```

This line tells the system to mount the swap space on the device `/dev/mapper/ssd-swap-swap` as a swap partition. The `swap` option tells the system that this is a swap partition, the `defaults` option tells the system to use the default settings for mounting a swap partition, and the `0 0` options tell the system to not discard and not check the swap partition for errors.

You can add this line to the end of the fstab file. However, it is a good practice to make a backup of the fstab file before making any changes.

To make a backup of the fstab file, you can run the following command:

```
sudo cp /etc/fstab /etc/fstab.bak
```

Once you have made a backup of the fstab file, you can add the following line to the end of the file:

```
/dev/mapper/ssd-swap-swap swap swap defaults 0 0
```

Save the fstab file and then reboot your system. The swap space will be mounted automatically when the system boots up.
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