I'm confused on these directions, because I do not have a "From" above the customers email option.

I would like it set up where my email address does not give them the option to reply back to any invoices or estimates.

Now when a invoice or estimate is sent through QB email, they are replying back to me even though someone else might have sent it and I am unable to help them. So I prefer them not being able to reply back to my email. How do I set it up where it is sent from QB instead of my gmail. 

Update, I found the "From" area, however it has our company name<[email address removed].

When I sent myself a test invoice and estimate, I had the option to reply back and it list the reply email as our company email, and we do not want them able to reply back. Only because 5 of us send stuff and the reply should not be an option since it is set to one email. How can I turn off the option for them to reply to the connected email address?