If your logo is not showing up on your Layout Output, it can be one of two things.
First in the Layout/Print dialog window make sure that the path to your logo is correct.
If that path is correct and you are still not seeing your logo, the next step is to make sure that the file format is a .BMP.
If your logo is not in .BMP format you can simply go into Paint and save it as a .BMP. When in Paint this is accomplished by selecting the File drop down, clicking the Open folder, and selecting your logo. Then return back to the File drop down, click the Save as option, and choose the BMP picture option.
Now that you have your logo saved as a .BMP picture you can go back to the iModel Layout/Print dialog window and browse to the .BMP logo.