Hi, Jim. The theme editor should be the last resort for changing anything.

Between WP settings, theme settings (if available), and plugin settings (all of them accessible through WP administration), you can usually accomplish simple changes like this.

You mentioned that you purchased the theme. Most paid themes come with instructions and support. I would start there.

Or tell us which theme you bought and exactly what you're wanting to change, and there will be a higher chance that someone here can help. (On a website the word "title" might be used to refer to several different elements.)

Steve