Open the relvant panel, cunningly called transparency. Things work differently between programs, so do read up in the help.
Ha! ha! yes, I see the transparency panel, and have reduce the transparency, but doesn't change the layer . . .mmmhh!!
If you're going to change the transparency of a whole layer, you have to target that layer in the Layers panel (click the circle on the right handside of the layer name), then change transparency.
many thanks for your help, thats great stuff!