Program 433Mhz universial remote with 433Mhz transmitter

Hi all!

I am making my garage door controller myself.
I bought 433Mhz transmitter and receiver, they work perfectly.
Model of transmitter: MX-FS-03V

I was thinking of using a 433Mhz universial remote to control it remotely.
But now my universial remote does not receive my signals?
Do I need to send a specific code (like: only numbers) or a specific pulse length or protocol or something?

I don't really know why it does not receive my signal.
This is my universial remote:

There is a note that says you can only use certain chips, but what does that mean? That they use specific signals?