Update process on selecting CryoCloud docker image tag (#76)

Process changed since we got image selector.

README.md

@@ -69,16 +69,18 @@ After your PR gets merged, our GitHub Actions will build and push a new image to
 can monitor the progress of this in the GitHub Actions tab in this repo.
 
 Once a new tag appears, someone with JupyterHub Admin permissions on the CryoCloud hub will have to
-update it to use the new image.
+update it to use the new image. With the new image selector, an admin will need to test the image in 
+our staging hub and then ask a 2i2c engineer to update the image by sending them the tag name.
 
-1. Go to the [Configurator](https://hub.cryointhecloud.com/services/configurator/) for the CryoCloud hub.
-2. Update the tag of the image under "User Docker Image" to use the new tag pushed for the PR in the
+1. Go to the [Configurator](https://staging.hub.cryointhecloud.com/services/configurator/) for the CryoCloud staging hub.
+2. Update the tag of the image you want under "User Docker Image" to use the new tag pushed for the PR in the
    [quay.io](https://quay.io/repository/cryointhecloud/cryo-hub-image?tab=tags) tags page. Make sure there are
    no trailing spaces!
 3. Hit 'Submit'. Note that due to a bug you might not get feedback that your submission succeeded - refresh the 
    page to see if the tag stuck!
 4. Once this is done, you can go start your server again (restart it if it is currently running). This will make sure
-   you get the new image, with the changes you have performed!
+   you get to test the new image, with the changes you have performed!
+5. The admin can then send an email to 2i2c with the tag we want added to CryoCloud.
 
 The [2i2c docs](https://docs.2i2c.org/en/latest/admin/howto/configurator.html)
 have some more information about the configurator!