Any Activities, for example, Pathways, Documents, Videos, eCreator courses, etc. that you create will be stored in Content Manager.
To find them, click on Content Manager from Common Tasks portlet on the homepage.
Alternitively, navigate to the Menu and click on Content Manager.
Search for the content by name using the Search box. 
Alternatively, click on one the Activity types filters to narrow your results (you can also click on these after you have searched).
To access the administration area for the Activity, for example, to add Users, click on the Activity's title. 
The administration area will look like the example below, with links to Common Tasks for that Activity listed first. 
The tabs on the left-hand side can be clicked on - please refer to the specific guides for further help.