Click the custom menu to enter the next setting page, and you will be prompted that "the subscription number must be authenticated by WeChat".
Click "WeChat authentication" in the above figure to enter the authentication step, set it as required, and wait for approval.
After approval, when logging in again, you can see "Custom Menu" in the left menu bar. Click this custom menu to enter and select "Open Custom Menu".
Then find "+"in menu management to add a first-level menu, and you can create up to 3 first-level menus, with up to 5 second-level menus under each first-level menu.
After adding the first-level menu and the second-level menu as needed, you can "set the action" according to your own needs, and click the setting menu to see the action setting.
After the setting is completed, you can preview the effect, and if you are satisfied, you can click Publish.