I think your talking about the "cursor"? If your using your mousepad on the laptop, be careful you aren't accidently hovering your fingers on the pad, it will click on the screen and move your cursor. Also, sometimes if the forum is acting funny I find it easier to post using source mode as opposed to editor mode. You can toggle with the top left icon. Hope this helps.
Also, if you find you are accidently tapping your mousepad, you can turn the tap function off so it won't happen anymore.
Whoever drinks the water I give them will never thirst. (John 4:14)
Trust in the LORD with all your heart, And lean not on your own understanding; In all your ways acknowledge Him, And He shall direct your paths. (Proverbs 3:5-6)