I am learning how to use the node editing but have come up with a problem. I have followed the instructions that were give on a tutorial but I cannot get the effect to work there are 2 effects that I want to appear in the final render but only one appears. Here is a screen shot of my node set up. If anybody knows what i have done wrong could you please tell me . Thank you. If you need any more information please just let me know. If I am asking wrong questions or asking for the wrong information i am sorry but I am new to this site and am just learning how to use the site properly. (larger image here)
Looking at your node setup, I think it is because you have the wrong socket plugged into the Composite node. It should be coming from the same Add node that the Viewer node is also plugged into. Maybe you were testing earlier and forgot to change it back?
Also, you can enable Backdrop while in the compositor to update your changes as you work, this can save you the time of rendering everytime you need to try a certain setup or see changes.
See What is the difference between a Viewer and a Compositor node? for more information.