Login to the app and click the ADMIN then RESELLER SETTINGS.
Under BRANDING SETTINGS, Click on the small edit icon on your right.
Click on the UPLOAD LOGO Button under change logo.
We recommend using a transparent PNG logo with a minimum size of 200×50 pixels and a maximum size of 600×300 pixels. You may also use GIF, JPG, or JPEG formats if preferred.
When done, click on the update button to save the changes.
Either refresh the browser, or logout and back in again to see your changes