registering and unregistering runners

Hi When I execute gitlab-runner list I see

basic                                               Executor=shell Token=14fbfb55ce827073ce0a3cdb40fd04 URL=http://192.168.100.235/ci
my runner                                           Executor=shell Token=24916f48a16967a590938c3d234d5b URL=http://192.168.100.235/ci
build                                               Executor=shell Token=0bf6a431342734ac9108d6ac15b5a8 URL=http://192.168.100.235/ci

On the runners page of my project I see no runners

If I try to unregister a runner - gitlab-runner unregister --url http://192.168.100.235/ci --token 0bf6a431342734ac9108d6ac15b5a8

I get this error

Running in system-mode.

ERROR: Deleting runner... forbidden                 runner=0bf6a431
FATAL: Failed to delete runner

If I register another runner I see it on the runners page of my project.

Please can you explain

• How I unregister a runner
• Why I dont see registered runners on my project page

Thanks