How to insert a new line when typing via Lenovo S820 keyboard?

I have Android 4.2.1 and I can't seem to find the new line button. Any idea?

Added (1). Here's a picture of the keyboard when I'm replying to a text:
That's the delete button above the smiley button

Added (2). Also that's how the keyboard looks like for all the other functions

Guest

There should be a small enter key somewhere on the keyboard.

Melissa Louise