In order to add links or images to your posts, you need to use the tools in the space above here. 

The link is the button that looks like a chain.  Click on that and paste into the URL line the address of where you want the link directed.  That's it.

The image button looks like a pair of mountains with the sun above them.  Click on there and insert into the URL line the address of the image file that you want displayed.  In Mozilla Firefox, you can get the location of the image by right clicking on it and selecting "copy image location."  Then all you have to do is paste it into the URL line.  For Internet Explorer, you can right click on an image and select properties.  Then, you copy the image address and paste it into the URL line.  Let me know if you are having any issues with it, and I will try to help.