Answer
For the Touch Apps server specifically, if that server itself is what should present the certificate, this is handled through standard IIS certificate/site-binding management, the same way you'd install and bind an SSL certificate for any other site hosted in IIS — it isn't a special IFS-specific procedure for that particular component. Other components in a multi-node topology, like the main application server, database server, and print server, each have their own separate SSL-configuration steps outside of IIS.