To remove the eTrader Trial Banner, you need to install a valid licence key in the Back Office Settings page. You can order a licence key at http://www.dotcomsoftwaresolutions.com/en/Products/Order-Licence.aspx.
When the licence key is installed, follow the link next to the licence key text box to register the product. On completing the registration, you will receive an email requesting confirmation of your email address. Follow the instructions in the email.
Once you have completed these steps, the Trial Banner will be removed.