This video is a step by step guide on how to connect to file servers or Windows server shares on a Mac.
Step 1: Click on go.
Step 2: Connect to a server.
Step 3: Type in the Ip address of the server or PC you want to connect to.
If you are connecting to another Mac use this format.
afp://IPaddress
If you are trying to connect to a Windows PC or Windows server use this format.
smb://DNSname/sharename
smb://IPaddress/sharename

To browse available shares that are on the same network as you. Do the following steps.
Step 1: Click on go.
Step 2: Go to Connect to a server.
Step 3: Click Browse
This will allow you to browse other PCs on the network that have enabled file sharing.