To add to the above -
Use 'alt+U' to enter 'fly' mode and use your controls (mouse wheel, arrows, page up and down, etc) to compose the shot as you want to take it.
To resize the screenshot and avoid distortion, when you open it in an image editor, select an area the full width of the shot but only 960 pixels vertical* (to get the correct proportions), move the selected area down to cut off any view of the top of the Surveyor screen, copy and paste as a new image, then resize this to 240 x 180.
*This is necessary because the original screenshot is not in the same proportion as the 240 x 180 image required.
To show the same shot in the forums, resize instead to 640 x 480 and upload to an image hosting website, then paste the 'forum code' you are given into your post.
Ray