how do I remove sim card

See this support article for how to remove or switch the SIM card in your iPhone --> Remove or switch the SIM card in your iPhone - Apple Support

Click here and follow the instructions.

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Ok I just got my SIM card stuck on my iPad can you please help or download WhatsApp for me

No one can download anything for you. If your SIM card is stuck, get an appointment at an Apple Store for help with this.