Just from reports view you can easily report missing work hours.

Simply by clicking on “Log Work” button in top right hand side corner or in report cell to report work for selected day.

Add/edit/remove Work Log from Report

Add Work Log on Behalf of Other users

Add work log for other user if necessary project permission is granted.

Make sure that project level permission Log Work on behalf other user in Team Worklog Reports application is granted. Check Team Worklog Reports - Administrator's Guide

Work Log is not available for Team Work Log Reports Lite version