Did you read the link in Post #6?
On the partition you want to store your data files, you need to create folders. For the contents of your MyPictures, make a folder with a name referring to the content, maybe use the name Photos. Then right click on the folder and click Include in Library. Move your pictures to the new folder.
You need to do this for the other data folders, such as Documents, Music, etc.
Library's are really just shortcuts to the real folders/files.