HI, i just started this game a little while ago, i wanted to try out the different classes but apparently i can only make one character... is that correct or am i doing something wrong? : / i see a place to make a second character but it wont let me.

As you have stated, there is a slot for a second character, but, as this is only the beta test period for the game, the option to create a second character on the account has not been implemented at present. Hopefully, as the game gets more support, they will implement the second character.... who knows, it may already be in progress for closed beta (but that is just me speculating)