playing with sketchup some more

i started playing with sketchup some more and realized i forgot how to add the picture on the walls. i feel so helpless i feel like i can't make anything everything i want to make it doesn't happen. the more i try to play with the more stupid i feel please if anybody reads this i'm desperate please give me any pointers i am in way over my head i can't even put the pics in the museum which is the purpose of this project.