Help for editing the theme.

[MasterLokito]

Good morning. I would like to ask the community for help editing a theme.
I have absolutely no idea where to start. If anyone has some free time and can edit it, I would be very grateful!
I will upload the background in a zip file.
I use this theme in USBMonitor, but the application has a bug where the HDD is constantly accessed.
Thank you in advance for your time in helping me.

PS: Sorry for the errors, I'm using Google Translate to help me write this.

black-white5.zip

[LicinioFortunato]

mate use another yaml theme file, just open it builder and edit like your own way. if any doub let me kn