You can either "disable" or edit the text in that box titled, by default, WELCOME.
A) To Disable:
1. Go to "MAIN" page and click "customize"
or go to " www.domainname.com/index/customize "
2. Click the "X" icon in the top right corner of the welcome text container. It will be deactivated and to finish, click "FINISH CUSTOMIZING". It can be activated anytime by dragging it back.
B) To Edit the text:
1. Click the "settings" icon, edit the text and save. Finally click "Finish Customizing".
I hope this helps.
Good luck