My question is not displaying both Band structure and density of states at a time, It is how to include the band gap value in the structure or in the calculation

This is simple, in the second picture, you will see that the conduction band minimum and valence band maximum are both located at G (gamma) k-point (direct band gap semiconductor) and they do not cross the Fermi level. Therefore, the software will automatically give you the value of the band gap (small gap at G point). On the other hand, from the first picture, you can see that the valence bands cross the Fermi level therefore the software will not detect a gap ( means the system act as a metal). In the first picture, you only give the spin-up illustration which acts as a metal, how about the spin-down (beta) character? Does beta gives semiconductor behavior? if so, this system will be considered as a half-metallic ferromagnets due to the presence of Fe element (sound interesting!).