What should i do to keep exported photo above 2mb min?

araza35817949  wrote I dont know if the headline is correct but, the problem is i am trying to send photo to a competition. their requirements are:

Unfortunately for you, the requirement that the size be not less than 2 MB and more than 4MB is utter nonsense. The requirements of dpi is nonsense. The requirement of specifying a maximum edge size in pixels, along with a dpi or ppi requirement, is nonsense. It obviously means that whoever wrote these requirements doesn't understand a key aspect of digital photography, that JPGs are compressed and that compression can produce different sizes on different pictures and so the file sizes are meaningless.

2. how i am gonna set 7-12 compression quality?

I believe that 7–12 refers to the compression quality in the terms used in Photoshop or Photoshop Elements. In Lightroom, the quality slider above 70 would give you the same compression levels (I didn't do the math, maybe you can go below 70 but anyway, that's close enough).

3. How i am gonna keep it between 2-4mb with this settings?

Well what I would do is to complain that the requirements are nonsense, and ignore it. However, what you should do is probably different, you can set the width of the maximum edge to 3200 pixels, and see if that helps.