1. Highlight an email in the list and from the kebab menu ,  select Reply,  Reply All or  Forward. 
2. An email dialog appears, where you can complete the Reply or Forward action. 
3. Select Send.

When forwarding/replying to an email saved to a workspace folder, you can send a copy of the email to the same workspace folder, if that folder has a valid WCSE (iManage Work Communications Server for Exchange) email address assigned to it.