How do I send a group text?

In order to send a group text to an existing group, please create a group of contacts via the Groups screen. Then, tap on this group and tap on the 'Text' button at the top of the screen.

In the group text screen you will see all the contacts with their phone numbers.
Choose the phone numbers that you want to send the message to, and then tap on the Compose icon at the top right corner.
Write the message, and tap on Send.