Centre
in the middle of the page

Use centre for titles.

Example:

This is centred.

This is the formatting toolbar

To centre text:

Put the cursor on the text that you want centred.
Click on this icon on the formatting toolbar.

To bold text:

Block the text that you want bolded.
Click on this icon.

To use italics:

Block the text that you want italicised.
Click on this icon.

To underline text:

Block the text that you want underlined.
Click on this icon.