Please can someone tell me how to castle online thanks

Take the king to the square you want it and let go.

Drag the king 2 spaces to the side.

I will help you if you send me a message. If you truly cannot understand how, I can show you with the live analysis board. Message me if you would like me to do this.

I know how to castle on a board but when I try in a live game I just end up next to the rook ?

Pick the King up to castle.

Thanks everyone , problem sorted!