How do I use the echo effect for messages

Mina313 wrote:

How do I use the Exho effect on my phone

type the message, hold down on the up arrow - swipe to screen tab and echo is the first option, then hit the up arrow to send

In addition to what razmee209 said, the "Add a full-screen effect" section of:

Use message effects with iMessage on your iPhone, iPad, and iPod touch - Apple Support

explains it in detail.