It has meaning because we want it to have meaning, and that's enough. The universe didn't come with meaning a-priori. We're not here because the universe has meaning; it's the other way around: the universe has meaning now because we're in it, and we choose to ascribe meaning to it. It's not 0 + 0 = 1, it's 0 + 1 = 1.
Think of it this way: does a pretty, shiny rock on the beach have meaning on its own? Not really. But if a human finds it and loves it, and it brings joy, now it has meaning. And that human treasures it and passes it down generation by generation, and now it has even more meaning. And now someone looks at this rock and thinks about their great, great, great grandmother finding it on the beach, and thinks about their great, great, great grandchildren receiving it in turn, and it brings them joy, and the meaning continues to increase.
The universe is a pretty, shiny rock that humans have found.