DNA is the most sophisticated design document we know in the universe. It contains all the information necessary to build a whole organism, say a human body.
The current theories of evolution do not even attempt to explain how any information regarding the requirements for survival were or are communicated into the DNA.
There are several ways (aside from human intervention) in which DNA can be modified. None of these modifications bring with them any information about the outside world.
So evolution seeks only to explain the mechanics of the DNA as a container. There is no attempt made to explain how the information got or gets there.
You could say that evolution doesn't even address the question of the information.
It is also important to note that DNA is an abstract design document. What do I mean by this? Well, that DNA does not contain one or a few of each kind of cell in the organism, say one or more skin cells, one or more bone cells and one or more brain cells. Instead DNA contains information that will be used to make these cells. The information is stored as sequences of A, C, G and T pairs.