Sign on the Ningxia Human Resources and Social Security Integration System. The signing steps are as follows:

1. Log in to the official website of the Ningxia Municipal Human Resources and Social Security Bureau and select "Unit Services".

2. Select "Organization Login" and enter relevant information to log in.

3. Enter the "Social Security Online Service Hall" page and click on the "Labor Relations" option.

4. Find and click "Electronic Labor Contract" on the labor relations page to enter the business application interface.

5. Fill in the contract content as required, and both parties will confirm and sign online.