How to use a PS4 controller with PPSSPP on Ubuntu 16.04

It is as simple as copying the files over from the memory stick/backup folder. The target directory for your saves inside the PPSSPP folder is PPSSPP\memstick\PSP\SAVEDATA. An example of a correctly placed PSP save would be PPSSPP\memstick\PSP\SAVEDATA\ULUS10036001.

SOLUTION: Ok, I went to a friend's house and he showed me how dumb I was.

1. As I said, I'm new to Ubuntu and I'm used to Windows' UI, so I always forget that, in the Ubuntu's UI, the menus are located in the top left area of the screen and not in the program's window. So I was able to enter the settings menu and map my controller

2. In Higan, the mapping is translated to something like this '1/Button/9'. The first number is some kind of controller ID and the following maps the buttons. My controller ID happens to be 64db7df00e8f0003. My second question was if somebody knew how to get this number. Using the 'evtest' it says: 'Input device ID: BUS 0x3 vendor 0xe8f product 0x3 version 0x110', so I see where some parts of the ID comes from. After some search I found this question: https://askubuntu.com/questions/366994/how-to-identify-game-controller-for-sdl2-in-ubuntu I wasn't able to compile the code (as I said, I'm still new to linux) but I think the ID must be this GUID or something like it.