Welcome Claralou.
You may notice that the protocol on GN is to put a poster's name in bold text. This is how it is done.
Bold An asterisk, at the begining of the name, no spaces.
Italics this symbol at the begiining and end of the text, no spaces.
Strikethrough no spaces. Although some devices don't seem to allow this.
I have added a screen shot my post, before I posted, so that you can see what I wrote to include the different types of text.
You can add images by chooing a file from your device.
People often use acronyms, you will see a tab at the top left hand corner of the page, with a list of them.
Remember to preview first!
Good luck!!