Enabling MU, and installing Multi-Domains (NOT working)

* For developers: WordPress debugging mode.
* Change this to true to enable the display of notices during development.
* It is strongly recommended that plugin and theme developers use WP_DEBUG
* in their development environments.
define('WP_DEBUG', false);

define(‘WP_ALLOW_MULTISITE’, true);

/* That's all, stop editing! Happy blogging. */

I included the "define(‘WP_ALLOW_MULTISITE’, true);" code into my config file (according to theses instructions: https://premium.wpmudev.org/wpmu-manual/creating-a-network-to-enable-wordpress-multisite/. Note I use .txt) and then proceeded to login (yes I made sure the file was saved)

I do not see the Network tab anywhere in admin?!

I also installed Muli-Domain according to the instructions (https://premium.wpmudev.org/project/multi-domains/installation/) and I receive this error when visiting my site "The Multi-Domains plugin is only compatible with WordPress Multisite."
Im interpreting that message is saying "define(‘WP_ALLOW_MULTISITE’, true);" rule is not working?

the WP install is Fresh from Fantastico on my cpanel.
I know how to edit files, create websites, and even manage whm and cpanel. so Im no nooob.

Thanks for your help!!