Step 1: Accessing the guild store
You can gain access to the guild store by visiting any local bank in the world.
Talk to the "Banker" and select "Guild Store" from the menu.
In the center of the bottom of the screen, make sure you select "Lucky Maniacs" if you are part of other guilds. Or hit the [F] key on your keyboard and select "Lucky Maniacs" from the dropdown menu.
Step 2: Browsing the guild store
To look for items you can use the filters under the title "Search store for" and hit [R] on your keyboard or click on "Start Search" in the center of the bottom of your screen.
Step 3: Buying an item
To purchase an item in the guild store you hover the item you wish to purchase with your cursor and press [E] on your keyboard. You will be shown a confirmation window. You hit [E] on your keyboard again or click on "Buy" to confirm your purchase.
After your purchase, the gold required will be deducted immediately from your purse. It can take some time for your item to arrive through mail*.
Step 4: Selling an item
To sell an item in the guild store you click on the stacked coins "Sell" icon in the top right menu of the guild store. You will be presented with a list of items you can sell. You can list up to 30 items in the guild store to sell. Selling an item, means you add the item to the "Listing". You can add an item to sell in the guild store by hovering the item you wish to sell with your cursor and hitting [E] on your keyboard. On the left side of the guild store window, you will be presented with an breakdown of the profit you will make.
The "Total price" is what the purchaser will pay for the item
The "Listing fee" is 1% of the Total price and will be deducted from your purse immediately and can not be refunded (standard in ESO)
The "House cut" is 7% of the Total price that will be transfered into the guild bank after and if the item is sold. If not, the amount will be refunded.
The "Profit" is what you actually earn for selling an item in the guild store.
Step 5: Removing an item from the store
You can easily remove an item from the store by visiting the "Listings" tab in the top right menu of the guild store. You will be presented a list of the items you have put up for sale in the guild store. Hitting the large "X" cross behind the item will allow you to remove the item from the guild store. You will receive this item via mail* after some time.
*sometimes relogging will make you get your item via mail more quickly.