You have not properly setup the theme.
When you log in there is a notice informing you to setup and configure the theme.
You must follow first 2 steps in order to set up the one-page template.
Once you do that you will not have any issues editing the buttons on the Welcome section.
Also, I would like to remind you that you are using the free version of our theme. I really do not appreciate the comment you posted on the 9th basically threatening to leave a bad review because we did not answer you fast enough.
We provide priority support for our paying customers and we answer tickets in the order they come in. Also, as it states in the right sidebar of this site, our support policy, that we only answer tickets from 9am to 5pm EST.