How can I fix my Dishwasher, Beko EcoCare D3421FW?

I need to replace the front contol panel on my dishwasher because the handle grip part has split. I have a replacement front panel and can remove everything off the old one easily except I do not know how to remove the programme control knob to release the programme timer off the old panel. Can anyone help? Its a Beko EcoCare D3421FW