Handle "Slice Struct" properly? (golang)

I have created a Slice Struct.
But why can't I append or output values?

package main
import "fmt"
type Slicestruct []struct {
	num      []int
	emptynum []int
}
func main() {
	slicestruct := &Slicestruct{
		{[]int{1, 2, 3}, []int{}},
		{[]int{4, 5, 6}, []int{}},
	}
	// is working:
	fmt.Println(slicestruct)
	// isn't working:
	fmt.Println(slicestruct[0].num[0])
	// isn't working:
	slicestruct[0].emptynum = append(slicestruct[0].emptynum, 99)
}

The error message is: "invalid operation: slicestruct[0] (type *Slicestruct does not support indexing)"

You need to dereference the pointer before getting an element

(*slicestruct)[0]

Since it's the actual slice you're accessing an element from, not the pointer.
For pointers to arrays (not slices as you have here), this step would be done automatically.

Here's a related question about pointers to slices and arrays: https://stackoverflow.com/questions/36242018/pointer-to-slice-and-array

Alternatively, you can remove the & when declaring your variable to make it not a pointer type. In the short sample we've seen here, there's nothing to necessitate a pointer. In general, legitimate uses of pointers to slices types are rare.