1) Install the software

sudo apt-get install sshfs

2) Add fuse to /etc/modules

sudo nano /etc/modules

3) Add yourself to the 'fuse' group, then log out and log in again.

sudo adduser your-username fuse

4) Create a mountpoint and give yourself ownership

sudo mkdir /media/mount-name
sudo chown your-username /media/mount-name

5) Mount the filesystem

sshfs remote-system-name:/remote-folder /media/mount-name

6) Unmount the filesystem

fusermount -u /media/mount-name

Directions lifted from Ubuntu forums and here also.

For myself, I had better results running the following command in the same directory that the file that I mounted resides in...

sudo sshfs user_name@subdomain.strongspace.com: folder_name

Where folder_name is the name of the folder that you are mounting strongspace to.