In Finder click Go and click Connect To Server
If you are connecting to a Mac enter afp:// followed by the IP of the computer you are connecting to
ex: afp://192.168.0.143
If you are connecting to a PC enter smb:// followed by the IP of the computer you are connecting to
ex: smb://192.168.0.142
Note: If you need helping finding the IP of the remote computer follow these steps
Click Connect
Enter the User Name for the remote computer and enter the Password
Click Remember This Password In My Keychain to avoid entering these each time
Click Connect
Choose the Volume (folder) you want to mount
Click Ok
Your Volume should now appear on your Desktop
If you don't see it, in Finder click Finder then Preferences
Put a check next to Connected Servers
If you want the Volume to mount each time you turn on the computer follow these steps
Click the Apple in the top left corner and click System Preferences
Alternatively you can click the System Preferences icon in the Dock
Click Users & Groups
Make sure your account is highlighted on the left and click Login Items
Drag your Volume into the Login Items window