Samsung LS19UBPEBQ-XAA - Manual (Page 14)

RGB IN
Connect the signal cable to the 15-pin, RGB IN on the back of your
monitor.
Kensington Lock
The Kensington lock is a device used to physically fix the system
when using it in a public place.
(The locking device has to be purchased separately.)
For using a locking device, contact where you
purchase it.
Stand Stopper
Remove the fixing pin on the stand to lift the monitor up and down.
See Connecting the Monitor for further information regarding cable connections.