Natural Selection cannot be a process because there are no specific laws governing it. It is just 'whatever manages to survive is deemed as selected'. Charles Darwin assumed an Intelligent selection process in nature (in line with artificial selection in which specific traits are chosen consciously in the animal being bred). That's why he called it Natural Selection. But since scientists do not believe in any Intelligent selection, it cannot be a process.
This is utter drivel. Darwin certainly
did not assume an "intelligent selection process in nature".
Look, natural selection really is very, very simple simple - even you should be able to grasp it.
We need only inheritance with variation to get it going.
Take a particular characteristic, as an example, say how tall some organism is. In each generation there is variation in height but generally taller organisms produce similarly tall offspring.
Now, we have an environment. For various reasons (access to light or food, or the need to see over other stuff) said environment might be favourable to (say) taller than average individuals, in the sense that shorter ones cannot get as much food or light or whatever. Hence, the taller ones are healthier, live longer and so produce more offspring.
Now because of all that, the average height of the population increases.
That is natural selection.
Notice that no individual organism can influence the process (it can't change how tall it grows), neither is there any external intelligence or instinct involved. Notice also, that if the environment changes, then the selection may change with it - it could be that shorter becomes an advantage because (say) the need to hide becomes more important than the other factors.
In the simplest cases, this may just be how fast a cell divides - too fast for the environment and the supply of nutrient is exhausted - too slow and something else gets it first.
In more complex cases, instinctive behaviours of individuals are selected
in exactly the same way; if food is more plentiful earlier in the day, then the behaviour of becoming active earlier will be selected.
That is why instinct comes from natural selection and not the other way around.