How to make Unmanged SEP client become managed SEP Client

Firstly, right click on Symantec Endpoint Protection Client on start menu taskbar as the snapshot below.
Then click on "Open Symantec Endpoint Protection"

You will saw SEP console interface, then go to help and click on troubleshooting on right top hand side.

Next, a window will pop out, click on import under Communication Settings. This step will ask you connect to server, mean we are now make a unmanged SEP client become managed SEP client.

Before that, you have to find out a file called "Sylink.xml". Then you have to select it, the file may get from SEP manager (which in server/core workstation) or get it from other computer which SEP client was installed. (C:\Program Files\Symantec\Symantec Endpoint Protection\...\...)

Wait for awhile, then you will saw the information of SEP client changed. Make sure it is correctly connect to server IP address that you able to see in the window.
For Example: 192.168.0.12 is my server

Exit the SEP console, and right click on the SEP icon again, you will see the difference context menu, compare with first snapshot.
Update Policy is to get latest config file, policy setting and virus definition from Server (SEP manager)

If you able to see the context menu of SEP client as last snapshot, that mean you have successful make unmanaged SEP client become managed SEP client.

Besides that, there is the other way to import sylink.xml

1) click on "Run", then type "smc - stop" without quote, to unload SEP client
2) copy "Sylink.xml" into C:\Program Files\Symantec\Symantec Endpoint Protection
3) click on "Run", then type "smc - start" without quote, to reload Symantec Endpoint Protection Client

Wish you good luck =)