You can change your dictation language directly from the preferences screen within TalkType.
First, open TalkType (either in the browser or the desktop application). In the top left-hand corner, you will see the TalkType logo with an arrow pointing down. Click on this, and then choose Preferences.
Scroll down on the page. You will see the option to change your dictation language. Click on the drop-down menu and then choose your new language.
You can choose between English (UK) and English (US) to dictate with.
Once you have configured this, you can press the X close button at the top right-hand corner of the preferences screen to save your changes.