first you need to loacte your PSP Files folder
for PSP 8 and above go to "MY DOCUMENTS"
now if you are using PSP 8 you will see a folder like this:
now click on that folder inside that folder you will see many folder find the one that is named "PICUTRE TUBES"
add your tubes in there
Now For PSP 9 and above
Go to "MY DOCUMENTS" in there you will see a folder like this one:
now click and open that folder and find "PICTURE TUBES"
place all your tubes in that folder
Nip