I am really new to after effects and anway I just finished a composition when i noticed the animation I had put in had the red box around it that lets you place it in different spots on the compostion, but it would not go away. When I render the video now, it has a giant red "X" on it. How do I get rid of this? Thanks
How do I get rid of this?
You buy the full version of whatever plug-ins you are using in demo mode.
As Mylenium says, the common way for plug-in manufacturers to mark the demonstration versions of their plug-ins is to place a large X as a watermark.
Also, since you're so new to After Effects, I strongly recommend that you work your way through the materials here.