Note the "New Post" button in the upper right hand corner. Also note the "Edit Post" pencil below each post.
Once you have clicked "New Post" you will be taken to a simple text/HTML editor. Above the Compose text box you will see a few basic tools. Most are obvious and change the text. The hyperlink button may be new to you. To make a hyperlink, first copy the URL address of a page, picture or file from the Internet. Highlight a word or phrase in your text that you wish to become a link, click the hyperlink button, paste the URL and click OK.
Note that in the upper right you may click Preview.