@wiedymi Other steps that I did to make it work.
sudo chmod +x /usr/bin/gyazo
Downloaded the icon in ~/stuff
(didn't find a better name)
https://raw.githubusercontent.com/gyazo/Gyazo-for-Linux/master/icons/gyazo.png
And then edited desktop entry to include the icon.
sudo gedit /usr/share/applications/gyazo.desktop
The line "Icon" from this:
Icon=gyazo
to this:
Icon=/home/algent/stuff/gyazo.png
[Desktop Entry]
Name=Gyazo
Version=1.3.1
Comment[es]=Captura de pantalla instantánea
Comment[fr]=Capture d'écran instantanée
Comment=Seriously Instant Screen-Grabbing
Keywords[es]=pantallazo;capturar;imprimir;upload;compartir;
Keywords[fr]=cliché;capture;impression;capture d'écran;upload;partage;
Keywords=snapshot;capture;print;screenshot;screen grabbing;upload;share;
Exec=gyazo
Terminal=false
Type=Application
Icon=/home/algent/stuff/gyazo.png
Categories=Utility;Graphics;
StartupNotify=false