Are you on a mobile or desktop? If you have access to it, desktop is ideal for adding pictures because you can drag and drop into the text box.

If you want to link another site, you can type it in ( ) and give a title within [ ] and you will create a hyperlink to other content without interrupting your train of thought.

While they are not always necessary or even appropriate, a little extra media does help support posts, do I hope this helps.