If you have a Pro plan, you can replace RealityMAX's logo in your scenes by uploading yours.
Within a scene, click Share preview.
Click the Add custom logo switch and upload your logo.
You can also set a default logo by going to your dashboard, clicking People & Settings > Settings, scrolling down to find the "Scene settings" section and uploading a logo. The default one will be applied automatically to new previews without affecting existing ones.