You can apply for an upcoming IPO through UPI for investments up to ₹5 lakhs with instant fund blocking, or use the ASBA method through net banking for higher amounts. For instance, you can access IPO applications through the Choice FinX platform by selecting your preferred upcoming IPO, entering bid quantity and price, then completing payment authorization. Both methods block funds in your account until allotment without immediate debiting, ensuring secure processing throughout the subscription period.