It’s easy to check whether your multisite will work on Pressable.
First, go to My Sites -> Network Admin -> Sites in the top-left menu.
Here, you will see your site and subsites.
Path-based Network (Subdirectories)
If your sites begin with the same domain but end differently (with a different directory), you have a subdirectory multisite. This configuration is functional on Pressable.
Domain-based Network (Subdomains, Domains)
Important: Domain-based network-type multisites are currently only available on 5+ site (Advanced or greater) or Premium plans.
If you are on a Pressable Plan that supports Domain-based multisites, you can toggle the Multisite Support option for your site in the MyPressable Control Panel. To toggle this option, you’ll need to access the site settings and then navigate to Advanced > Multisite Support.
And then toggle the Multisite Support option:
You can also toggle this option when creating a new site by toggling the option here:
For more information on creating a WordPress multisite network, see this guide from WordPress.org.