License Key to activate plugin

Hello,

Just purchased the plug-in and got the license mail. I have the license number but I can not find where to enter it. In the plugin readme it says ;
– Go to ‘Slide Anything PRO’ page within the WordPress ‘Settings’ menu
– Enter your provided License Key, and click the ‘Save Changes’ button to activate plugin
(you should see a green ‘ACTIVE’ message once the plugin is activated)

Unfortunately no “Slide Anyting Pro” selection under my wordpress setting menu. I was using the plugin without a problem, today I updated my WordPress Theme and this may caused the issue.

Could you please help me to activate my license

Thank you

Ekin

The page I need help with: [log in to see the link]