i am not a newbie on crypto markets but could not solve that issue. been trying to buy altcoins with my BTC balance (checked it twice, everything is fine with btc deposit) but when i try to put an amount on buy order box, "BUY" button just grays out and does not let me click it. Is there any way to solve that issue?
Make sure you are filling out the first wo fields and then your button should not be gray'd out
put in the amount you want to buy in units
then in the second collum put in the current buy rate it shoudl do the math for you
Also remember the minimum trade size is 0.0005 BTC, if you are trying to buy smaller amounts low cost alts, that may be the issue.