To do this you need one of our paid subscriptions.  If you want to use your own logo instead of the Yumpu one, don't deactivate this function. Otherwise no branding at all is displayed (not from Yumpu and not your own). Learn how to upload your own logo here

First go to "My Publications"

Then click on the pencil icon to edit the magazine

 
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Then scroll down to the checkboxes and uncheck "Branding in Yumpu Player".

If you want to display your own logo or just deactivate the Yumpu logo follow the steps above. If you want to remove the "Powered by claim", go to the embed wizard and use the "Advanced" Embed.

Then go to the tab "Player elements" and deactivate the "Powered by claim" feature.