Help with gun model please

I’m pretty new to unity and i am adding in a model of the gun. I added in a more realistic version of the gun rather then the 3 cubes that made my gun previously. The game model and everything looks as below. //I’m not good at making this particular question but i think my pictures should help. (lol // code joke) Anyways i would love some help and feed back as to why my game still shows the older model rather than the new one. I saved exited and came back and it didn’t help.


It also has this:
StartServer listen failed.
UnityEngine.Networking.NetworkManagerHUD:OnGUI()

I’m brand new would appreciate help