How to redeem the code for a purchased e-gift card?

Hi, I currently have been using a 90-days FB Plus pass, which expires on 27th Feb, 2024. I also have purchased the $79.99 pass (for one year access to FB Plus) -it shows in my FB wallet, and I wish to activate it after my current pass expires in February. However, I do not seem to find any code to put in for “redeem a code” option, and I do not know how to redeem this e-gift card when the time comes. Could you please help me?