How I equip my buyed itens?

Click this and on the items you want to equip click [Activate]

In addition to the phishing response, you can also equip items in your inventory using the in-game feature. With the newmenu option activated, you can find the "Open inventory" item under the "Store" tab.

There you can handle most of inventory operations that you wish, including equiping/unequiping items.