You’re talking about your user parameters, right? Your user params shouldn’t be in the details panel. They are in their own window tab. If you don’t see it anywhere (iirc the default is bottom left), then you can turn it on using the window tab at the top.
If you mean you’re having trouble with adding them to certain functions on the emitter itself, you should be able to just click the carrot on the right of any of them and type in the name of your parameter you’re looking for.