Step -1: Go to Windows Server Manager Dashboard and select Add Roles and Features.
Step -2: In Add Roles and Features wizard, Click Next.
Step -3: Select Role-based or feature-based installation in the installation type.
Step -4: Select the server that you wish to install FTP service and click Next.
Step -5: In Server Roles step expand Web Server (IIS) role and check FTP Server role service. If you have already installed web server make sure that IIS Management Console tool also install.
Step -6: Complete the process and click Install.