Can't place an order

 
I can't place an order because the icon 'place order' is light grey. What do I have to do to fix this?
 
-EB20-:
I can't place an order because the icon 'place order' is light grey. What do I have to do to fix this?

Its either because you haven't enabled trading for that specific instrument (MT4/5 >> View >> Symbols) or you have logged into your trading account with the investor and not the master password.