Very welcome.
To post a screenshot, Click the "Upload Images" link at the top of the forum. Read the notes from the link provided.
Once you've successfully uploaded it, you'll have a url for it. Make sure the image name that you attah to it is
exactly the same as the name on the uploaded file. It's case sensitive.
Then click the icon on the second row, 4th from the left when making you post. It looks like a picture in a white frame.
It puts this in your post:
[im
[/color]g]URL[/im[color=Red]
g]
Delete the "URL" and replace it with the url of your uploaded image. Make sure you have no spaces between the url itself and the square brackets on either side.
That should do it.