problem with emergency lights, inside lock switch and key locks & trunk...

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Hi, when I try to put the emergency lights on they don't work...when I push the lock button inside the car nothing happens...the keys also has a problem it's still working but is very delayed and sometimes after pressing to unlock or open the trunk it still wont go so I open it manually...I went to auto zone and they told me I needed to replace an electronic flasher (a cube piece that supposed to plug into something; tripdon ep-35 12.8v/ 182w max is what is says on it) So I'm wondering if this is what's going to fix it and if so where does it go? If not please tell me way I need to fix it...thx in advance.