It's really a bit difficult. I think you have first to understand how D3D works with his files. There is a lot of tuto...
Anyway, you can type 'F2' for the preference menu.
Go to 'Content' > click on 'Content directory manager'.
In this windows, you can add a directory to 'Daz Studio Format' and go to select one directory where you have put all your dowloaded stuff (uncompressed with DIM or manually).
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For example F:/DAZ_LIB2
Personally, I use the 'manual' way. It's work for 99% of the stuff. (but there is no entries in the 'Smart content')
For some add-ons, you also have to change the registry path if you haven't installed DAZ in the default path :
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I think that's all
...
Sorry for my english !