How do I activate my GTC?

Hello there, I'm wondering if you could help me with a question regarding activating my GTC. I've recently been introduced to the world of cryptocurrency and I'm excited to start using my Good Till Cancelled (GTC) order, but I'm not quite sure how to activate it. Could you please guide me through the process? I'm looking for a clear and concise explanation, so that I can get started as soon as possible. Thank you in advance for your assistance!