How to enter my signature in the yellow field?

Hi!

I hope you are doing well.

Thanks for sharing the helpful screenshots. It seems that you have added the signature block and due to which you are getting the name, date, and email fields.

The signature block is not like a digital signature field which lets you sign the agreements with a digital signature. You need to add a digital signature field in order to get the complete info. See this article for detailed steps and info: https://helpx.adobe.com/sign/using/field-types.html 

I hope this helps.

Thanks,
Anand Sri.