You're very welcome.
Hmmm... if you had mistakes, did you revert the file back to original?
I'm guessing you did and I'm also guessing that's a v1.35 version.
So... let's try this again;
In your main \includes\languages\english - meta_tags.php, find;
Code:
// page title
define('TITLE', 'Zen Cart!');
// Site Tagline
define('SITE_TAGLINE', 'The Art of E-commerce');
Replace the above with;
Code:
// page title
define('TITLE', 'Japan Shop Direct');
// Site Tagline
define('SITE_TAGLINE', '');
That's all you need really. You may have forgot to leave the empty quotes or something. You just have to be careful to only changing the text between the start and finish quote tags. Then, if everything is good... your page title will show in the browser tabs and such.