diff --git a/central_frontend/src/api/RelayApi.ts b/central_frontend/src/api/RelayApi.ts
index 33f7546..2951884 100644
--- a/central_frontend/src/api/RelayApi.ts
+++ b/central_frontend/src/api/RelayApi.ts
@@ -1,5 +1,5 @@
 import { APIClient } from "./ApiClient";
-import { DeviceRelay } from "./DeviceApi";
+import { Device, DeviceRelay } from "./DeviceApi";
 
 export class RelayApi {
   /**
@@ -13,4 +13,29 @@ export class RelayApi {
       })
     ).data;
   }
+
+  /**
+   * Create a new relay
+   */
+  static async Create(device: Device, relay: DeviceRelay): Promise<void> {
+    await APIClient.exec({
+      method: "POST",
+      uri: "/relay/create",
+      jsonData: {
+        ...relay,
+        device_id: device.id,
+      },
+    });
+  }
+
+  /**
+   * Update a relay information
+   */
+  static async Update(relay: DeviceRelay): Promise<void> {
+    await APIClient.exec({
+      method: "PUT",
+      uri: `/relay/${relay.id}`,
+      jsonData: relay,
+    });
+  }
 }
diff --git a/central_frontend/src/dialogs/EditDeviceRelaysDialog.tsx b/central_frontend/src/dialogs/EditDeviceRelaysDialog.tsx
index c042692..ca9a161 100644
--- a/central_frontend/src/dialogs/EditDeviceRelaysDialog.tsx
+++ b/central_frontend/src/dialogs/EditDeviceRelaysDialog.tsx
@@ -10,6 +10,7 @@ import {
 import { TimePicker } from "@mui/x-date-pickers";
 import React from "react";
 import { Device, DeviceRelay } from "../api/DeviceApi";
+import { RelayApi } from "../api/RelayApi";
 import { ServerApi } from "../api/ServerApi";
 import { useAlert } from "../hooks/context_providers/AlertDialogProvider";
 import { useLoadingMessage } from "../hooks/context_providers/LoadingMessageProvider";
@@ -53,7 +54,8 @@ export function EditDeviceRelaysDialog(p: {
         `${creating ? "Creating" : "Updating"} relay information`
       );
 
-      // TODO
+      if (creating) await RelayApi.Create(p.device, relay);
+      else await RelayApi.Update(relay);
 
       snackbar(
         `The relay have been successfully ${creating ? "created" : "updated"}!`
@@ -73,7 +75,9 @@ export function EditDeviceRelaysDialog(p: {
 
   return (
     <Dialog open>
-      <DialogTitle>Edit relay information</DialogTitle>
+      <DialogTitle>
+        {creating ? "Create a new relay" : "Edit relay information"}
+      </DialogTitle>
       <DialogContent>
         <DialogFormTitle>General info</DialogFormTitle>
         <Grid container spacing={2}>