pen tool options bar

hey everyone. im familiar with photoshop but editing pictures for fun to get used to it. ive drawn lines before with the pen tool and its not hard, but for some reason photoshop wont let me change the weight or color of the line i made. this should be a super easy thing that i have now spent 2 hours on. ive asked all my graphic designer friends and they dont know and neither does the internet. the options bar where i should be able to change the weight and color will not let me click them and everything else on the bar is greyed out. im going crazy at this point trying to draw a line ahhhhh anyways please give suggestions thanks.