wavelet decomposition with db4

hi, i want to get DWT from a EEG signal with this parameters: (part of an article:) "frequency subbands that approximate to delta, theta, alpha, beta, and gamma subbands: delta (0–4 Hz), theta (4–8 Hz), alpha (8–15 Hz), beta (15–30 Hz), and gamma (30–60 Hz) ,use db4" in the second part of paper: "After the coefficient of each subband was computed by the DWT, subband EEG components were reconstructed separately, by filling the other subbands with null parameters, to be converted into signals of the same data points as the original EEG signal." i found wavelet toolbox menu but cant use it,can you help me?

thanks.