Hi HugeHead! Welcome to Chihuahua and welcome to the forum.
There are two ways to include a picture in your post. If you have a URL for it, you can use Insert Image. Clicking on that button will include a tag: [img][/img]
You put the location of the image inside the tag, something like this:
[img]https://theforum.lexigame.com/2014-02-25%2012%2010%2057.png[/img]
If the picture is just on your computer, you can make it an attachment to your post. You have to click on Additional Options, under the area where you type your message. Then you can click the "Choose File" button and select your image file - as I've done in this reply.