How to use Requisitions?

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I am a relatively new halo 5 player, and I was wondering how to use the requisitions (the cards you obtain in packs). I have quite a few cards for different guns and vehicles, but I can't seem to figure out what they're used for.
I've figured out how to open packs here:
But I can't figure out how to use this page at all:
How can I use that page?
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How do you get requisitions in Halo infinite?
Requisition Packs can be earned by ranking up in Spartan Rank or completing Commendations. Completing Arena or Warzone matches rewards Requisition Points, which can be used to purchase Requisition Packs.What do the cards in Halo 5 do?
While playing through matches alongside your friends and enemies, you'll be able to build up points, which in turn can be used to purchase REQ packs with cards inside. You'll be able to use these cards over the course of multiplayer matches to gain advantages in modes like Warzone. Earning points is easy.Fallout 76 - SUPPLY REQUISITIONS AND HOW AND WHERE TO USE THEM
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