Navigation menu appearing below blog; Please help!

Hello all,
I posted this last night, but it disappeared for some reason. Can the old-hands here please give us a hand?

We are brand new to blogging, and are so excited to have installed our very first wordpress blog here on our website:
https://www.solaswebdesign.net/blogindex.php

We are using a theme from the WordPress Themes page called Aquafluid, and if you visit are page, you will see that we managed to customize the header. However, you will also see that the navigation menu is appearing BELOW the main column of the blog. We can’t figure out why and would so appreciate your help troubleshooting this.

Thank you in advance for your time and thoughts!
Kind Regards,
Miriam