There is no file “qa-theme” but from the comments it seems you mean “qa-theme-base.php”. That file is where the core HTML output comes from, but it can be overridden by your theme or by plugins.
Look in the folder for your theme under the “qa-theme” folder (e.g. qa-theme/SnowFlat), there should be a file “qa-theme.php” (this is why I asked for the exact file you edited, because some have similar names). In qa-theme.php you will see some of the same functions as qa-theme-base.php, try making your change in here.
If it still doesn’t change then it could be due to a layer plugin. This is harder to find but it will be a PHP file somewhere under the “qa-plugin” folder.