Login in Ftp, and go to themes/Your_Theme_Name/templates, open the page.tpl.php file under your theme folder.
Around line 92 to 96, you can find the following code: <?php if ($logo): ?> <a href=”<?php print $base_path; ?>”><img src=”<?php print $logo; ?>” alt=”home”/></a> <?php endif; ?> >
Change the alt to whatever you want. Say your site is local information related, www.glassescanada.com, you can Change “home” to “Glasses Canada”:
<?php if ($logo): ?> <a href=”<?php print $base_path; ?>”><img src=”<?php print $logo; ?>” alt=”Glasses Canada”/></a> <?php endif; ?>
Note, drupal uses UTF-8 charset, if you use non-English or non-UTF-8 code, you have to use Dreamweaver to convert the code to UTF-8.