How did you create the picture folder? And how are you using to browse your files?
Assuming you are using MyFiles, go to the DCIM folder, tap on menu (left capacitive key) and select "more". And you will have options to copy and cut. Tap on it, make your selections, then go to the folder that you want the pictures to be and select paste.
The idea is the same if you are using other file managers although the process might be slightly different.
Also, the easiest is actually to use the USB mass storage option and make the file and folder changes via PC.
Cheers