Do you have an image of the ship setup? It would be useful.

Just from what I read, I have the feeling you 1) Have the wrong engine on, 2) Loaded premium guns and don't have premium Ammo.

If you could let us know what kind of engine you have on your DD, it will be useful. Make sure you put the DD engine on your ship. You might possibly have chosen a ss engine by mistake.

and yup, you probably don't have any premium ammo. you have to buy them first before you can use those weapons.

( E.g Premium HedgeHogs)

all above is true,

z1 engine is DD I heavy

mine launchers and PHH launchers have premium ammo which is available at nf store or you can get it from drop which is 10% possible since current event is near ending unless tomorrow will be blitz + 200%xp and item drop you can recieve PHH ammo and naval mines.

(OH BTW, DON'T USE THE NORMAL HH!) its to expensive if your new to the game