Can I ask the stupidest question you've ever been asked? because I bout Manga studio, which comes as Studio Clip Paint, and I've spent the last week googling and unable to find how to reduce the opacity of a layer. I just want to make a layer that's slightly see through.
Open layer properties, go to advanced layer options. There should be a thing for opacity.
[Here], a page from the dummies book talking about layer options..