You or your solicitor will receive a copy of the proposed settlement agreement from your employer. You will both need to read it through.
Your solicitor should go through the agreement with you to ensure you understand the terms and that they are fair to you. Either you or your solicitor will go back to your employer with
the proposed amendments. On very rare occasions it is possible to move straight to signature.
Once you have received the final agreement (there may be different versions or negotiations to get to this point). You and your solicitor both need to sign the relevant parts of the agreement and return it. It only becomes open and binding when signed by you and your employer and the solicitor. You then need to comply with your obligations under the agreement and ensure you have a copy for your records.
You will then need to await your employer to make the payments in accordance with the terms.