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Oops... I have not seen these comments.
Open this file on OpenSCAD. The top three lines will be:

logo = "your_logo.png"; //set your logo file name
logo_x = 420; // width of the logo image in pixels
logo_y = 74; // height of the logo image in pixels

Put your logo file in the same folder as the keychain.scad file or type it with the path:
logo = "C:\my_logos\your_logo.png"; (NOTE: you need double slashes, I can't put double slashes in the comments...)