How do I add a graphics to my site?

At the bottom of this forum post reads in small print (under the Answer text box):

" You can format your answer with Markdown. If you need a Markdown Cheatsheet, we've got you covered." read from that list, to include links or code you want us to see. so example if you want to write a line of code first you have to press the space bar 4 times then start typing or paste that line. Each line needs to start 4 spaces then the code after the spaces. To post link to an image file you start with exclamation point.

They did this because its a way to keep the malicious code from user input in this text box you type in away. Cheatsheet is your friend. Use it and try and break it down into sections of what you are trying to accomplish. Be especially specific on what we are unable to read or see on our side.

Re the second question-make sure your images are in the same folder as your html and css files. The first I'm not so sure about because I'm still learning too. Best of luck.