We can add guardian details for an employee even after he/she had admitted to the institution.

  Login as Admin or Privileged employee and follow the below steps.

At the top of your dashboard, click the module access icon > Administration > Human Resource > Employee Search to open the Employee Details page.

In the Search field, enter the employee’s first name, last name, or employee ID to search.

  1.  Click over employee name to display the profile.
  2.  Select Personal option under the Profile.
  3.  Click on Edit option to update guardian details..

For more clarifications, please watch this.