What part of the PM reply is not working for you?

Can you click on the message to read it, bit can't find how to reply?
Is the reply box area showing for you?
Typing in the area doesn't work?

Are you using a computer or phone or tablet, some parts show up different on different devices..
Or if you are using a different style or theme..
Apple /mac or Windows or other OS?

Maybe we can help you figure it out..