While company contributions are suspended, you are not able to apply for participant contributions (employee matching contribution).
After the childcare leave, resumption of "company contributions" will be registered at the department in charge of the defined contribution pension plan at your company.
After that, you can apply for participant contributions.
Please check with your company as to when company contributions will be resumed.
(1) For plans which allow applications on the AnswerNet, after the resumption of company contributions is registered at your company, you can apply on the "Application for Participant Contributions" screen.
(2) For plans which allow applications through company, please check with your company.