Hi menze-j,
If you want to change the button, you can use the following CSS code, add the code to the Backend > Site template styles > GK Photo > Advanced Setting tabs > Custom CSS.
#gk-menu-button > strong:after, #gk-menu-button > strong:before {
background: #fff;
content: "";
display: block;
height: 3px;
position: relative;
top: -6px;
-webkit-transition: all .2s ease-out;
-moz-transition: all .2s ease-out;
-ms-transition: all .2s ease-out;
-o-transition: all .2s ease-out;
transition: all .2s ease-out;
width: 25px;
}
#gk-menu-button > strong {
background: #fff;
border-radius: 2px;
font-size: 0;
height: 3px;
left: 30px;
position: absolute;
top: 33px;
width: 25px;
line-height: 1.7;
}
If you want to change the "Photo" text with your image or text, you can go to the Backend > Site template styles > GK Photo > Features.