Turn on the Edit Mode, then hover your cursor over the CLV to which you want to add new content.

Click on the CLV.

You will be redirected to the Sites Explorer in the creation form of the content having the same type as other contents in the CLV.

Details:

Field	Description
	Maximizes/minimizes the screen.
Close	Closes the content creation form without saving the content.
Save and Close	Saves the changes done and closes the creation form.
Save	Saves the changes done without closing the creation form.

Fill all the fields in the form. The field name is required.

Click Save or Save & Close to save the content.

After closing the content form, you can view the content and do some actions listed on the Action bar for the content. See the Working with basic actions for more details.