Normally there are a variety of store permits

Generally you can obtain "cash shop points" through the opening page of the website. You are not quite done yet. After you get your points, you need to log back into in the game. Just follow the steps outlined below:
1) Enter the cash shop
2) Select the ETC tab,
3) Then select the store sub tab.
In this section you should see, at least 1 kind of shop permit, as well as several other shop related items. Just click buy on the shop permit you want and follow the instructions in the game.
4) Choose your desired Store Permit and follow the directions.
Normally there are a variety of store permits to choose from; however, there are factors you should consider before making your purchase. Obviously you will have to have enough money for the permit. The cheapest of the store permits on Global Maple Story is roughly pennies a day, and the most expensive permit, if used on a daily basis, costs approximately a dollar a day. You must also consider your other resources, such as, the amount of time you have access to your computer, your computer's stability, and your network stability.