Openwhisk Nodered namespace

Hi everyone, I'm new to nodered, i'm developing my own project in i would like to use the openwhisk nodes, remotely i have a small kubernetess cluster on which i have deployed some actions that I would like to call through the openwhisk nodes, i have some problems, however, i cannot no way to enter a namespace, the drop-down menu does not allow me, i do not even have the possibility to ignore the certificate when invoke action, does anyone know how I could solve the problem?