Hello @serdarangungmail-com,

To increase the no of slider you have to activate the child theme .

Child theme references :

https://codex.wordpress.org/Child_Themes

You can also create the child theme using the plugin . Below is the link to one of them.

https://wordpress.org/plugins/wp-child-theme-generator/

After creating the child theme in your child theme functions.php file paste below given code .
https://gist.github.com/anonymous/a97860d16fb637cfb190df2d694da003

Hope this helps.

Best Regards!!

Hello @serdarangungmail-com,

Glad we could help you !!

If you have any issues further, please feel free to post your queries and we will happily help you further.

We will really appreciate if you could help us too by rating our theme in WordPress repo here:-

https://wordpress.org/support/theme/business-hub/reviews/

Best regards !!