I have a WordPress site I am trying to repair

I can't log-in to http://myevault.com.au/wp-admin/

The site is half-working which means the WordPress database is being accessed, I just can't log-in.

Please note this is live http://myevault.com.au

I just want to log-in so I can save the slideshow, if I can't log-in soon I will have to start from scratch, please help!

When I try to log-in I get this message;

Notice: Undefined index: status_layerslider in /home/myevault/public_html/wp-content/themes/Avada/functions.php on line 41

Notice: Undefined index: status_revslider in /home/myevault/public_html/wp-content/themes/Avada/functions.php on line 72

Notice: Undefined index: status_flexslider in /home/myevault/public_html/wp-content/themes/Avada/functions.php on line 96
Notice: Undefined variable: avada_color_scheme in /home/myevault/public_html/wp-content/themes/Avada/header.php on line 1897
class="home page page-id-2 page-template page-template-full-width-php">