You could just go into your Admin Control Panel > Customization > Themes > Edit HTML & CSS > Templates > globalTemplate and then locate this: <title>{expression="output.getTitle( $title )"}</title>Then you can remove everything between the <title> tags and then insert a custom title. For example: <title>WebFlake</title>However the side effect of this is that if you change the title of your website, it will not auto update, you just will have to go fix it manually.
[b]Description:[/b] To put it simply it welcomes newly registered members. It will welcome them with an optional personal message, email or topic alert. From there you can further customize each pm, email or topic message, the subject / title and so on. It also has the ability to welcome members that are added manually through the Admin CP.