Whether you're starting from scratch and it's your first time building out content on the platform or you have a fresh new logo from your marketing department. Updating your header logo is a great way to establish your brand.
The header logo can be whatever ratio you'd like it to be, e.g. 300x100 (3:1), but size should never exceed 350px in either direction, width or height. In other words, header logos will look best if they are under 350px wide and under 350px tall.
To set up or change your header logo simply...
1.) Click on your photo at the top right and go to Settings
2.) Make sure your in the "Company" Section under Configuration
3.) Click on the Company Logo tab
4.) Click Upload Image in the Header Logo section.