The Group title is always required. The Meeting time is optional and so is the Description.
The Description input box allows you to use the Enter key but this does not create a new line in the Groups display. If you want a new line you must enter <br> - an HTML tag. You can also create bold text by including it in <b>bold</b> and italic text by including it in <i>italic</i> tags.
If you want coloured text try <span style=color:#ff0000>coloured</span>.