To add a logo, please follow these steps:
Click the Settings menu (circular profile pic) at the top right of your screen, then select "Customise" from the dropdown menu.
In the Logos and Images section, click the "Choose File" button underneath App Logo or Logo For Reports, depending on where you would like the logo to appear.
Choose a valid image file to upload.
Click the "Save Changes" button at the bottom of the screen to apply the changes.