From Celoxis

To fill time while updating task progress:

1. Go to your Project.
2. Click Tasks from the list of project specific reports view.
3. Point at a task and click the action drop-down 
4. Click on % and Comments from the Status Update section.
    

5. In the %* box, type the % Complete.

   If the % Complete box is grayed out, it means that the task progress can only be updated via the time-entries.

6. In the Hours box, enter the hours as HH:MM. You can pick appropriate timecode from here. 
7. Selecting/De-selecting the Send for Approval will Send or Save the time-entry accordingly.
8. Enter update comments in the text area provided.
9. Click on Submit.

The comments entered when entering a progress update can be edited from the Task Update Report. 

To edit the task update comments:

1. Create a Task Update report.
2. Add filters like 'Date', 'Update By' to see the update you want to edit.
3. Under the Comments column, click on the actions drop-down .
4. Click on Edit.
5. Remove/Edit the original comments to add new ones.
6. Click on Save. The new comments will be added to the update.