Here is the translated text with HTML tags preserved: "Open the WhatsApp application on your device. Tap the three dots icon in the upper right corner to open the menu, then select Settings. Navigate to Privacy and scroll down until you find the Group option. If you want to allow everyone including those not in your contact list, select the 'Everyone' option. If you only want to allow people in your contact list, select the 'My contacts' option. To restrict who can add you to groups, select 'My contacts, except...' and then choose the allowed contacts. If there are further instructions, press 'Done' to save the settings changes."

For you iPhone users, here’s how to manage your WhatsApp privacy settings to prevent being added to WA groups indiscriminately by others:
Open the WhatsApp application on your iPhone.
Go to the Settings menu.
Select Privacy, then find the Groups option.
To allow anyone, including those not in your contact list, to add you to WhatsApp groups without needing approval, choose 'Everyone'.

To limit additions only from people on the contact list, select 'Kontak saya' or 'My contacts'. If you want to be more selective, choose 'Kontak saya, kecuali...' or 'My contacts, except...' and specify who is allowed to add you to groups. It is recommended to select the option 'Kontak saya' or 'Kontak saya, kecuali...' so that you are not added to random groups. Tap 'Selesai' if prompted to confirm the settings.