Services->User,entware, Configure to set boot enabled.
The Status column is not accurate, as most entware initscripts don't return an appropriate status value.
To load the kernel module add 'modprobe tun' in the initscript before starting the daemon ( /opt/bin/zerotier-one -d) and 'modprobe -r tun' after stopping the server (killall zerotier-one).
But these are not Alt-F related questions, Entware-ng has its won forums, I believe.
Noticed the Alt-F warning at the install page?
Warning: Entware-ng is alien to Alt-F, conflicts might arise.
Packages configuration files have to be manually edited.
or at the Entware User Services?
You must NOT enable services that might conflict with Alt-F services and services have to be manually configured.