Hello,

After following the below steps and clicking save, the action "send an email" in the Publisher section doesn't show in the case feed of one of the support process. Any suggestions? Thanks

From Setup, click Customize | Cases | Page Layouts.
How you access the Case Feed Settings page depends on what kind of page layout you’re working with.

For a layout in the Case Page Layouts section, click Edit, and then click Feed View in the page layout editor.
For a layout in the Page Layouts for Case Feed Users section, click  [Case feed layout expand button]  and choose  Edit feed view. (This section appears only for organizations created before Spring ’14.)

Select Use Page Layout Editor to Configure Actions.
Click Save.
To access the page layout editor:

For a layout in the Case Page Layouts section, click Edit.
For a layout in the Page Layouts for Case Feed Users section, click  [Case feed layout expand button]  and choose Edit detail view. (This section appears only for organizations created before Spring ’14.)

In the page layout editor, click  [page layout editor change tool]  in the Actions in the Publisher section.
In the palette, click Actions.
Drag the actions you want to the Actions in the Publisher section. You can also drag actions to change the order in which they appear, and can drag off actions you don’t want. 
On the Case Feed page, up to approximately five or six actions are displayed in the publisher; the rest are included in the More drop-down list.
Click Save.