If you are a Vault Admin login to My Virtual Vaults.
Navigate to Vault details.
Navigate to Branding.
Click on the current logo to upload the logo of your choice.
By default the Virtual Vaults logo is displayed in the top left corner of your Vault, but you can change that to your company logo or another image. Make sure the image is in .gif, .jpg, .png format and doesn't exceed 200 KB in size.