Unknown garage door opener

Hi,

I'm trying to re-program my garage door opener for a new remote control but I can't find the instructions to how to do it.

I found many tutorials on the internet but the tutorial always talk about a "Learn"-button which I dont have in my garage door opener.

I cant find the name of the company that made my garage door opener. The only thing I found in the  garage door opener  is :

 - MR-II 600

The buttons I found are : 

SET
CODE
UP
DOWN

Found a manual on the internet : 
http://www.portshoppen.se/wp-content/uploads/2016/03/Instruktion-Mido-SvEng.pdf