Add SSHFS preparation.

docs/general/General_tools/Using_sshfs.md

@@ -18,6 +18,37 @@ installed through apt-get:
 download FUSE and SSHFS from the [osxfuse
 site](https://osxfuse.github.io)
 
+## Prepare your Arc account
+
+A public SSH key will need to be installed into your Arc home directory.  Ensure you have a `.ssh` folder in your `/home/[your_cadc_username]` folder.  You can do this through the UI:
+
+https://www.canfar.net/storage/arc/list/home
+
+1. Ensure you are logged in using the pulldown in the top right menu.
+> ![image](images/sshfs/login.png)
+
+2. Visit your `Home` folder.
+> ![image](images/sshfs/home.png)
+
+3. If there is no `.ssh` folder listed, create one.
+> ![image](images/sshfs/add-folder.png)
+
+> ![image](images/sshfs/new-folder-name.png)
+
+> ![image](images/sshfs/folder-created.png)
+
+4. Ensure you have a file called `authorized_keys` with your SSH public key in it.  This public key should match which ever private key you are using to authenticate with.  For example, if your private key on your local machine is `${HOME}/.ssh/id_rsa`, then your public key is likely `${HOME}/.ssh/id_rsa.pub`.
+> ![image](images/sshfs/auth-keys.png)
+
+5. Upload the `authorized_keys` file to the newly created `.ssh` folder on Arc by following the link to the folder in the browser, then `Upload`ing the file
+> ![image](images/sshfs/folder-created.png)
+
+> ![image](images/sshfs/add-file.png)
+
+> ![image](images/sshfs/file-added.png)
+
+Now you can proceed to mounting it.
+
 ## Mount the Remote File System
 
 For Ubuntu/Debian Linux or Mac OSX, the instructions are below.