No edit menu found

I am a newbie. I downloaded a model from internet and i tried to open it in blender. When i opened it and pressd A a rectangle box was created over the model and there was no edit mode but only object mode was there. I want to bake the texture.How can i do that.Please help me asap.

Select your object with RMB then see if there is edit mode.

Also moved thread to the correct support forum.