Disguises are only accessible to players with a donator rank. The higher your donator rank, the more disguises you'll have access to.
To disguise as something, do /disguise <entity>(in short /d <entity>). To undisguise do /undisguise (/und). To toggle seeing your own disguise do /disguiseviewself (/dsv).
To redeem a trail, right-click the trail book. Trail books can be obtained by opening random trail lootboxes and these can be found in crates or when completing quests.
To activate a trail, do /trails and chose particle trails. Then right-click the trail you want to activate. Activated trails can be removed when clicking the paper in the main menu.
Hold an item and do /hat to put it on your head.
Shoot an exploding cat a people with /kittycannon!