Mounting Remote Server for editing files on my Mac
It looks like the software might not be installed the right way, or in the right place.  On a Mac, the easiest way to install sshfs and fuse is with Homebrew.  


Install Homebrew http://brew.sh/ 
brew install sshfs

This will install dependencies such as fuse4x.  Read all the instructions that appear -- some of other steps may be required, such as

brew link fuse4x
sudo /bin/cp -rfX /usr/local/Cellar/fuse4x-kext/0.9.2/Library/Extensions/fuse4x.kext /Library/Extensions
sudo chmod +s /Library/Extensions/fuse4x.kext/Support/load_fuse4x