FSX IFly 737.

I want to have add-on-textures but when i have unpacked them i put for example the delta 737-800 from the flight 1 library; in the 737-800 IFly. I add the new model in the config manager and then i start FSX. NO Delta 737-800 I do all thing in the my fleet document i can't get the texture to work, Also the same for others!!! I post a topic on the IFly forum itself but i can't get a good Explanation. I also installed the 1.02 Update.