Legacy: Adding JavaScript or other code to your Landing Page can permanently break your login.

You cannot add JavaScript or other code to your LaunchRock page.  

NOTE: If you try to add code like this, you could permanently break your login.  

If this happens the only fix is to delete all the content from you page, so that you can rebuild it again without the code in it.  The good news is while your login is broken, your page remains live and collecting emails without interruption.

HTML hyperlinks and other basic HTML text effects like Bold and italics are OK and will not break your login.