How to create users & provide access to K8s Clusters

I have two K8s clusters with user admin & authenticating with user token in my .kube/config file. Similarly I want to create users to my team & give access to these cluster, but not sure how to setup this. I tried with Juju users & it didn’t work. So I am trying to find on how to create users & token to my team to access the clusters.

Thanks