I am have trouble make just a simple plain translucent. In the “shaders” tab I have the transparency up to .9 and the plane is still not see through. What do I do?

For transparency you have a few options.
*On the material tab, turn down the alpha.
*On the Mirror transparency tab turn on Ztransparency or Raytransparency on and move the fresnel up.
Be sure to turn Raytracing on in the render settings if using raytrans.

HAHA!! That got it thanks. Finally I know how to make something transparent.