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.