This web site uses drupal 8, the drupal pages refer to drupal 7. Examples will not work, guest login is not enabled.

IMCE

Installation: install the module from https://www.drupal.org/project/imce

Then:

admin -> configuration -> CKEditor -> edit desired profile -> file browser settings -> file browser type -> IMCE

admin -> configuration -> CKEditor -> editor appearance: drag IMCE button to desired location.

admin -> configuration -> CKEditor -> editor appearance: tick "Plugin for inserting files from IMCE without image dialog"