Actually, you haven't offered proof of that claim per se. DNA could have been designed by an intelligent force, or DNA could have self-formed from natural, unintelligent processes, but from your presentations to date we see no proof of either (and without such proof, one can't make valid claims of either being the correct explanation).
On the other hand, we do know that computer programs are designed by intelligent forces. We also know that computer programs are the only known phenomenon in the universe that match DNA's characteristics of storing data, processing data, and replicating.
Even more convincingly, we know for a fact that intelligent forces such as Man can reprogram DNA via gene-splicing.
Thus, the scientific mind can view the evidence at hand and readily see which of the two possibilities has the most supporting evidence.