How to plant mines?

[KIA]

Im having problems with planting mines. I can select the weapon fine with the red line highlight the mines in the top right corner, but when I press my action button it does nothing. In other words changing weapons in the normal fashion to get to mines doesnt work. I can't select or plant them. Is there some other key command im spose to use. Please help 

[-ViTaMiHnM203-]

What mines are you talking about? Teller mine, Spreng mine; or do you mean the dynamite? If you are talking about the TMi and SMi then you just click the fire button to plant them when you have them in your hand. With the dynamite you need to find the red colored planting location.