Updating credit card, adding licences and changing sync plan can be done on the My Account page in the AppExchange.
  1. Visit Yoxel’s AppExchange page.
  2. Login to the AppExchange using the link in the upper right hand corner.
  3. Click on your name and select My Account link.
  4. Select More Actions next to Yoxel to manage your account.
If you are not using self-service and would like to add additional licenses or change sync frequency, send a request to support@yoxel.com