If you have written a text in a node, you mark the text to bring out the editor you use to edit your text. You can have your text in bold or italics, create a bulleted or numbered list and you have the option of two different headline sizes. If you mark a word and click the link symbol a field will appear where you paste the link you want to use. Click enter and you have created a hyperlink. You can also click an image you have posted and change its size and decide if you want to place it in the middle, to the right or to the left.