Delete button on Wordpress website

Looking for a specialist with experience of cms Wordpress.

The challenge was to remove the button on the website. Shes probably in the code is written, in the admin, it is not found.

We also from hosting a letter

"To specify the correct mailbox of the sender instead of letters (mail) to the Correct mailbox is created on the hosting service, which is sending emails. "

Need to find this mailbox and replace.

Details and additional questions will be answered in PM. Need advice and implementation.