I am  new to Ether delta  and  I don't like it

I have tranferred my  tokens  from  Bittrex  to  Etherdelta  and  now  I want to  buy  a  coin

But  everytime  I  try to by  the  red  offers  on the upside it shows  me  this message:

''You cannot trade this order because you don't have enough funds. Please DEPOSIT first using the Deposit form in the upper left. Enter the amount you want to deposit and press the 'Deposit' button.''

I have  the  funds...  why    this message?