Is there a way to change the Live Stream logo for a channel package?

You need to upload a broadcaster logo. This is found under MY ACCOUNT and then COMPANY PROFILE. If you change your player themes to draw from this, you should be good and not get the DaCast logo appearing.

If you want to create a package in the new Back Office, follow this link.

If you want to learn more about how to create a player theme, follow this link.