All source control systems come with 2 applications - server and client.
Source Control Server is a software that really does the software tracking and storage of files. You must install the server software in a secure computer in your office. This will be the machine where the files and multiple versions of them are stored. So it is important that this machine is protected from direct access of any of the members in your team.
All files will be stored and retrieved to this machine using the Source Control client software. Each member of the team should install the client software in their machines. The client software will send and receive files with the server software. So, the team members do not need direct access to the server computer.
Users perform all actions through the client software. The client software will communicate with the server software to execute the user tasks.