To remove any hotlink from any of the Signature apps, tap on the hotlink to edit. On the Edit Hotlink page, tap of the icon representing the hotlink, e.g. Facebook etc. You will have a list of hotlink types to choose from. Choose 'none' (the icon with a question mark). When you exit the edit page, the icon will be removed.

Note: in the next release, we will put a dedicated button to remove the hotlink.