tweak verbiage

src/views/ContactsView.vue

@@ -684,7 +684,10 @@ export default class ContactsView extends Vue {
   private async onClickNewContact(): Promise<void> {
     const contactInput = this.contactInput.trim();
     if (!contactInput) {
-      this.danger("There was no contact info to add.", "No Contact");
+      this.danger(
+        "There was no contact info to add. Try the other green buttons.",
+        "No Contact",
+      );
       return;
     }