Windows 7 - How do I set up mapped drive for write?

Please help me with setting up a networked drive. I'm new to networking so I hope I get my terminology right.

Both the host and client PC are using Windows 7 and these are the settings I've done.

Host PC:
Shared drive D:
In advance sharing, I've given full control to;
-Everyone
-Terminal Server User
-HomeGroupUser$


Client PC
Mapped the drive to drive P:

So I can browse and open all the subfolders and files this drive I've shared. However I can only drag and drop files into the root of P: (ie. P:\ )
If I try to drag and drop to any subfolder, like P:\Songs\ , a message will pop out saying "You need permission to perform this action"

How do I give full write/modify access to the client PC?