how to edit cdf files

ive jusr download the brooklyn nets patch and bobcats 2013 patch
i want to put the large medium and small logos of the bobcat to the brooklyn nets patch
simply i want to put them in sama logo iff.
but when i done it the default bobcat logo still show..
pls help me pls..

you open the iff file with the same filename as the cdf with the mod tool. Even though you are opening the iff file, it edits the cdf file