Add in the diced jalapeno, and then pour in the evaporated milk.
On low heat you will begin melting down the cheese, stirring often. It is important to heat low and slow or it will burn.
-Once the cehese dip is melted, yo ucan cook it for a few extraminutes, and this will thicken the sauce up, if youw ant it thicker.
If you find you want the Queso Blanco dip thinner, you can add extra evaporated milk in. Just open a second can of milk and pour it in.