Document Custom Fields does not appear in the template sender's fields in the DocuSign

I created several Document Custom Fields in the DocuSign in order to use them in one of my templates.

Such as Document Custom Fields:

• Contact Email
• Contact Name
• Contact Telephone No

After creating those fields, then I set up a template and upload a envelop word file. I wanted to insert/place those document custom fields in the document, they do not appear in the sender’s filed drop down list.