Re-configure kibana to new cluster

My kibana is already enrolled on a cluster, but the cluster failed to boot (the PC failed to boot and will be reinstalled). Can I reconfigure kibana to a new cluster? I don't care about losing existing data in kibana as I haven't touch anything yet.

You should be able to do that with a new enrollment token, yes.

is it possible to do it from the web UI, or should i use the one in the bin folder of kibana?

You need to do it from the CLI.