Changing the Goodbye.html text ,do this from Player settings

I received a reply from support 

http://en-au.articulate.com/support/storyline/customizing-or-suppressing-the-goodbyehtml-page-sl1

Customizing the closing page

You can customize the closing page to complement your organization or content. You'll need to have HTMLand/or JavaScript skills.

1. Close Articulate Storyline.
2. Browse to the following folder, depending on your version of Windows:
   • 32-bit Windows: C:\Program Files\Articulate\Articulate Storyline\Content\lms
   • 64-bit Windows: C:\Program Files (x86)\Articulate\Articulate Storyline\Content\lms
3. Make a backup copy of the goodbye.html file in case you need to restore it later.
4. Open goodbye.html in a text editor, such as Notepad or Notepad++.
5. Edit the text, change the colors, add images, or insert JavaScript code (e.g., a close button).
6. Save and close goodbye.html.
7. Republish your Storyline course and upload it to your LMS for testing.

Suppressing the closing page

We don't recommend suppressing or removing the closing page. Doing so can interfere with LMS functions. It's best to customize it instead (described above). If you need to suppress the closing page, try the following method. Please note that this is unsupported.

1. Close Storyline.
2. Browse to the following folder, depending on your version of Windows:
   • 32-bit Windows: C:\Program Files\Articulate\Articulate Storyline\Content\lms
   • 64-bit Windows: C:\Program Files (x86)\Articulate\Articulate Storyline\Content\lms
3. Make a backup copy of the Configuration.js file in case you need to restore it later.
4. Open Configuration.js in a text editor, such as Notepad or Notepad++.
5. Locate this line of code:
   
   var EXIT_BEHAVIOR = "SCORM_RECOMMENDED";
6. Change it to:
   
   var EXIT_BEHAVIOR = "ALWAYS_CLOSE";
7. Save and close Configuration.js.
8. Republish your Storyline course and upload it to your LMS for testing.

Tip: If ALWAYS_CLOSE (in step 6) doesn't work in your LMS, try ALWAYS_CLOSE_TOP.