You can put URLs in your content like this;
http://www.nhgc.asn.au/ or www.williamolive.com/
and they will be automatically interpreted as a link. That is they will be in blue text and be clickable as long as they are a valid URL to start with. If the url you are linking to does not start with www., then you will need to ensure that you post the link with http:// so that it is interpreted as a link. The previous site used a tool call BBCode which was not true HTML and is not supported on this site.
To place a picture you will have to use the proper HTML image tag which is much easier than it sounds.
<img src="http://pics.nhgc.asn.au/albums/userpics/10033/IMG_2148_resize.jpg" width=300 /> is how to structure a link to this image:

the parts are:
- <img this is the Image tag.
- src= src means "Source" as in the source of the image"
- "http://pics.nhgc.asn.au/albums/userpics/10033/IMG_2148_resize.jpg" is the URL of the image, or where it's kept on the internet. This needs to be somewhere that the image is already stored on the internet, not on your computer. Usually you can right-click on an image and choose "Copy Image Address". Notice that you need the address or URL of the image, not the URL of the page that the image is on. You can upload images to our gallery first, then display the link in your post. It's best to put quotes ( "" ) around the url.
- width=300 makes the image display at 300 pixels wide. It's generally best to not use Width or Height, but instead to post a smaller image to the internet where you want it displayed smaller. This particular image however is very large, so would not look good displayed in this post at it's native size. There are thumbnail images on the gallery which you can use in the first paragraph of a story if you want it to appear on the front page. These thumbnails are already a good size.
- /> this closes the tag, i.e., this is the end of the image tag.
A Full description is available here.
You can also attach files to your content if for example you want to allow people to download a PDF document or a track log. You could of course attach a image but people would have to download it to see it.
Thanks for the contributions Dawson