How to set up gitlab CI runners?

If you can access the settings for a project, then you can find the information in Project Settings > Runners. There should be a box under Specific Runners that has the URL and token.

EDIT: As of GitLab 9.0, this info can be found under Settings > CI//CD Pipelines (per Josh Noe)

EDIT: New location as of GitLab 9.3 (maybe earlier): Settings > Pipelines

EDIT: New location as of GitLab 10: Settings > CI / CD > Runners Settings

Apparently the only way to do that is to be admin of Gitlab your CI server deals with yourself.

I find that unreasonable, but what could be done?..

As of GitLab Enterprise Edition 12.0.0-pre 8104b83f087

The token can be found by:

1. Go to your gitlab project
2. Click on Settings
3. Click on CI/CD
4. Click on "Expand" on the Runners section
5. The token is under "Set up a specific Runner manually"

the Url is your Gitci Url. the token you mention its in your gitlabci under "runners" next to the line:

"To register new runner you should the following registration token. With this token the runner will request a unique runner token and use that for future communication"