im using photoshop. i made a background with the render -bla bla bla bla bla and now i have a background how do i insert a picture , without it taking up my back ground. in ohter words when i paste a picture on a seperate layer it covers up my back ground and i cant see it. and how do i crop and make the picture look like its supposed to be there.?

select your picture layer

press Ctrl + T

crop is down using the little black button thignys on the four corners

double click on the picture once its at a size of your liking

will this take away its white back ground thing?

if you mean have the render out with out the white space around it, then if its just white or black
or just ONE color, you cna use the magic wand tool, click on the white space and clear delete. If the render is inside a picutrewith a multi colored background like buildings or w.e.
then you can use the maraque tool to select the render and cut it out.

other wise, i dont really know what your trying to ask