Button Mapping +Button

I’m trying to play a game that uses the + button, but I cant find it in Citra controls. I’ve tried home, select, and start to see if they were the + button, but they don’t work, so I wonder if I’m missing anything

In order for us to provide better support, we need to see the log generated by citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File

Could you give me an example? The 3DS does not have any + or - buttons on it. So I’m having a hard time picturing what game would ask you for this.