To use Advance Trade make sure you have balance in the Trade Wallet.
Please refer to the article below:
How to Buy
* Log on to www.gokumarket.com
* Login to your registered account
* Hover your mouse pointer to the Trade Menu at the top left of the screen.
* Click Advance
* Now, select trading pair from BTC, ETH, and USD(s) (What are Trading Pairs?)
* For instance, to Buy LTC using BTC, Select BTC and then select LTC/BTC from the list
* On the right, the Order Book and the Buy and Sell Tab can be located
* Buy is selected by default and is highlighted in Green while Sell will be displayed in Red
* Enter the rate at which you would like to buy the coin, for instance, you want to buy 10 LTC at the Rate of .005957 BTC, now enter .005957 in the BTC Box.
* Enter the amount of LTC coin you want to buy in the Volume Box
* The Total BTC (amount to be deducted) amount will be displayed just above the Buy button.
* On confirmation, Click on the Place Buy Order button
* The Order will now appear under Order Book (What is Order Book?) and will be there until the order is matched with a Seller.
* Once the order is filled or executed the LTC amount will be credited to the LTC Trade wallet and BTC will be deducted.