To deposit coins you must make sure you are logged in.
First, click on the top right corner menu and then on "DEPOSIT"
A popup will appear where you will need to select the coin you wish to deposit:
Select the coin from the menu and then you just need to copy the address and paste it to your wallet.
After you copy & paste the address, you can close the popup. The rest of the process is made normally outside DynX.
You just need to send the coins to that address and wait for the necessary blockchain confirmations for the coins to be available in your balance.
Note: There are NO deposit fees in Dynx. You will only pay for the normal blockchain fees of the coin you are depositing.