How do I claim a draw by threefold repetition

Click on the Draw button.

I am in the same position, but when I click on the draw button, it just offers my opponent a draw, which he then declines. Can anybody help me, clearly I am misunderstanding something. Here is the link to my game. https://www.chess.com/daily/game/183091040

Threefold repetition requires the same board position to be repeated three times. That is not the case in your game.

Hi there. Thank you - so it's not the same move repeated three times over?

The same position has to be repeated 3 times.

No.

In your game you repeated the same move back and forth. Your opponent did not. If he had done then you could have claimed the draw if the position had repeated three times. The same board position has to repeat three times for a draw claim to be valid. This can arise from the same moves being repeated but does not have to be.

Press the draw button after the repetition

Read the thread in it's entirety. The OP has already been given the same advice, and the new poster was pressing the draw button but did not understand the rule.