http cuz i don't know how to setup the router using ssh
You'll need to learn at least a tiny bit since you are using snapshots. You can install LuCI and then use the web UI from there -- you must have done this once before because your device isn't supported with any official stable release and therefore has only been used with snapshots.
You have installed a snapshot image. Read the link for instructions how to install Luci, which is not installed by default in snapshots.