How do you accept a challenge?

Hi, no doubt a stupid question BUT how do you accept a challenge when its them to move first?

Cheers 🙂

It sounds to me like someone challenged you ,made themselves white and did not make a move yet.So you will just have to wait till they move,then when you make your move you have accepted the challenge.Most people make the move as soon as they create the game if they make themselves white.Mike