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I am somewhat embarrassed to not know more than I do on these cameras and lenses. I bought a cheap tube extension set. All manual controls but I have a "shutter" in both my lenses that will not open using these. Am i just missing something or did I get some that will not work with my lenses...

I have a D90 and an older gen 70-300mm lens, no vr or any of the extras. I am shopping for a good lens in that same range maybe a little stronger but I see several 70-300 that all have different identifiers. Please help. I have seen some from $130-$6500....