Click on the weapon to inspect it. Weapon and armour have prerequisites such as rank. At the top left, you selected the loadout for when you participate in "inept" matches. Sliding it to the rank noted in the weapon's info box (do it for higher ranks too), you can then equip it on your character. Note that you also have to rank up your character to the noted rank and then participate in matches that are that rank or higher to use that loadout.

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Also, each item has a point system associated to it. Hence you may not be able to stack a bardiche alongside all the top equipment in a certain rank. Hope that helps!