IMAGE_FILE_HEADER struct

I want to set the IMAGE_FILE_DLL bit found in the Characteristics field of cshell.dll that is found in the IMAGE_FILE_HEADER structure. I opened cshell.dll using LordPE, and tried edit PE, but I don't see any particular box for IMAGE_FILE_DLL bit value. There is a characteristics box with a value beside it, but that defines that the PE is a 32-bit dll, if I change that, then ollydb can't open cshell.dll at all. Thanks in advance.

why do u want to mess with cshell header?

im trying to unpack it, but its encrypted. So I thought if i change the header of cshell, i can unpack it using pe explorer.