How do you program a elv143S transmitter for the 2003 Honda Civic LX?- the tutorials on youtube do not work for this key fob

How do you program a elv143S transmitter for the 2003 Honda Civic LX?- the tutorials on youtube do not work for this key fob

That remote appears to be for various add-on security systems, not for a make/model of car.

If you are using it with an add-on system, then it's the name of that which you need to find the correct programming info.
eg. It's for add-ons like these:
https://www.carid.com/2003-honda-civic-alarms-remote-start/

If you do not have an add-on system then as far as I can tell it is useless.