Labels can be updated one page at a time or you can update the labels on multiple pages at once. Open the label menu for the pages you with the update, from there you can
Update Labels on a Single Page
Hover over the page you wish to update and go to the Label column. Select the edit icon when it appears to open the edit labels dialog.
Update Labels on Multiple Pages
To update more than one page at once. Select the check box next to all of the pages you wish to update.
Then select Labels.
When working with multiple pages at once the label menu will have an additional column to show how many pages each label is applied to.
Add a new label
To add a new label select Add Label.
Enter the label you wish to add and select accept.
Each separate word will be added as its own label. To add a two word label try using a - eg. release-notes.
Select Apply to add the label to the page.
Edit a label
To edit an existing label select the edit icon next to the label you want to edit.
Change the label and select accept
Select Apply to update the label.
Delete a label
To delete a single label from a page select the delete icon, next to the label.
If you delete the wrong label you can easily restore it.
Select Apply to remove the label.
To delete all the labels from a page at once, select Remove all labels
If you change your mind you can restore the labels before you apply the change.
Select Apply to remove the labels.