@myii Thank you for reply. Is there any way to do this in FluffyChat? I can load ubports.chat webpage, but of course Riot Web is not working in Morph Browser. Also when I write https://ubports.chat:8448 in webbrowser, I can see that Synapse is running. The problem is that FluffyChat can't connect to homeserver.

@myii Thank you, everything is working now.

Just to mention, I also found how to configure port in FluffyChat. You just need to edit file

.config/fluffychat.christianpauly/fluffychat.christianpauly.conf

and change line

server=ubports.chat

to

server=ubports.chat:8448