Go update slice iterating error “does not support indexing”

Type *Members does not support indexing, type Members does.

m := make([]Members, 5)
pm := &m

m[:2]     // good
pm[:2]    // bad
(*pm)[:2] // good

https://go.dev/play/p/CDaBKqB-sqM

package main

import "fmt"

type Member struct {
    Name, Surname string
    Age           int
}
type Members []Member

func main() {
    members1 := Members{
        {"Bob", "Doe", 30},
        {"Jack", "Doe", 30},
        {"John", "Doe", 30},
    }
    members1.ModifyName()
    members1.ModifyAllNames1()
    //members1.ModifyAllNames2()
    fmt.Println(members1)
}

func (members *Members) ModifyName() {
    (*members)[0].Name = "-"
}

func (members *Members) ModifyAllNames1() {
    for i := 0; i < len(*members); i++ {
        (*members)[i].Name = "-"
    }
}

func (members Members) ModifyAllNames2() {
    for i := range members {
        members[i].Name = "-"
    }
}