Are you missing some options in the Meraki Dashboard?

Don't you see the options to set Splash page, Access control and/or DNS-Based Walled Garden Support under Configure tab? Just ask Meraki via technical support for firmware upgrade:

Feel free to use this template

Dear Meraki support,

I'd like you to get the access to the features described below:

https://docs.meraki.com/display/MX/Splash+page
https://docs.meraki.com/display/MX/Access+Control

https://kb.meraki.com/knowledge_base/adding-domains-to-the-walled-garden

I'm seting up my Meraki Dashboard to be used with SOCIFI.com service (https://marketplace.cisco.com/catalog/companies/socifi/products/socifi) and these features are required.

Please update the device's firmware at your earliest convenience.

Thank you in advance.