How to add a field in modifying network by GIS tool?

Hi, 

When sketching the network by GIS tool, I am trying to add a new attribute in the network.  I have tried "start editing" and "stop editing", but I can not use below function to add new filed.

On the other hand, I tried to open the Table, but I still cannot add new filed.

 Could anyone please help me to solve it?

Thank you very much.

Regards,

Jeff

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