If you want to change your company logo go to Settings > My company > Company data > Company logo > Edit and attach your logo in JPG or PNG format.
We can also change the company logo from the main home screen, clicking on the logo image will open a screen with the option to click on the image to change both the logo and our corporate color.
Bear in mind that if the size of the image is too large, the logo may be too wide in your documents. Likewise, if the image is too small, it will not be seen properly. Try until you like the result.
Remember that you can always modify the size of the logo by creating a watermark and indicating it in a template.
If instead of changing the logo, what you want is to delete it, instead of attaching a new one, click on the trash can shown in the image.