Help Guys!!

Hi guys!!
I'm an old flyer but I'm new on this forum!
And i've yet a problem......!
I've downloanded several new textures (only textures!)
for a Dc 9 that was working well.
Now I really can't understand how install the new textures on my favourite airplane!!
just copying the new folder intothe aircraft folder,nothing happens......!
Can you help me?!
Thank to all!!
Cheers!
I'm an old flyer but I'm new on this forum!
And i've yet a problem......!
I've downloanded several new textures (only textures!)
for a Dc 9 that was working well.
Now I really can't understand how install the new textures on my favourite airplane!!
just copying the new folder intothe aircraft folder,nothing happens......!

Can you help me?!
Thank to all!!
Cheers!