You need to write a text file containing the remapping you desire, which you'll then pass to the batch file that writes said remapping "into" the teensy. This is done with a simple text editor (think notepad). See this post of mine with my own mappings for the M122 and the F122 keyboards that I have:
keyboards-f2/examples-of-soarer-convert ... ml#p390537
Copy the code that I posted there, paste it into a text file and save it with whatever name you want, with an .sc extension. That's the remappig file you'll use.
Do take one important thing into account: for remapping you need to think in two different "levels": the lower, physical level, and the uppper, national (or logical) level. For example, look at your keyboard and locate the key that is right next to the L key. In Soarer's docs and remappings and whatnot, in the physical level, that key is called SEMICOLON (because in the US layout, that one has the ; symbol printed on it). When remapping, the SEMICOLON key has to stay as the SEMICOLON key, and that is why it won't be mentioned in most remapping files.
In the upper, logical level, the operating system is configured with a specific national layout, so that the signal sent by the (physical) SEMICOLON key will be received by Windows (or Linux, etc.), who will understand that signal to mean that a ';' character has been typed... on an English national layout. The same SEMICOLON key will produce an 'Ñ' in a Spanish layout, an 'Ö' in a German layout, etcetera.