Go to the Create Audio page from the laft side navigation and click the "Create Audio" button.

Enter the title and your text into the Editor.

Click on Voice Name to select a language in the list and select Voice and Confirm.

You can filter the voice to suit your requirements. You can also make the voice as a Pinned, so that it will always be visible at the top to make it easier to choose.

Add a new text block using the ‘+' button. You may select different voices for each block of text.

At last, click the Export button to convert to speech.