You can modify your title tags in the admin area of WordPress. Go to Settings > General, simply edit the Site Title field and hit Save.
Be aware that you cannot set custom title tags for each post or page you create. There are numerous SEO plugins that assist with managing your Title Tags such as YOAST or All-in-One Pack SEO
It is a long established fact that a reader will be distracted by the readable content of a page when lookin