Hi @MargauxCella 
The employee needs to be under your supervision on the Company Tree EP204061 form

This is what help indicates: 

When the Employee box in the Selection area is cleared, the following time cards are listed on the All Records filter tab:

• Your time cards
• Time cards of the employees for whom you are an appointed delegate
• Time cards of the employees who report to you
• Time cards of employees in the workgroups at lower levels in the company tree than your workgroup

You should be able to create timecards for the above list

Thanks a lot ! It works ! 

@MargauxCella adding to @Anacarina Calvo another method would be to add time card enterers as a delegate on their employee profile!