You can submit the request for approval to a manager using the Submit for Approval option

The manager to whom the mail is addressed gets the request for approval mail with the link. On clicking the link, it opens a form with approve or reject option & request details.
The manager can either approve or reject the request and then save the details. A notification mail will be sent to you along with the request id, approval status for request and comments. This is fundamental so that you need not revisit the request at periodic intervals to check the approval status.
On the left-hand side panel of the request details page, the approvals tab displays all the emails sent for approval in descending order with sent on, sent to & status details of the requests.
Once the request is approved by the manager the status of the request changes to approved. If rejected by the manager, the status of the request changes to denied.