You can edit a timesheet's in and out times in the Web App for any user, even if they have already been submitted.
This article shows you how to do it from the Web App. If you want to edit a timesheet from the Mobile App, click here for a tutorial.
This video shows you how to edit time in the web app:
Step by Step:
Click on Time in the main sidebar.
Use the filters at the top of the screen to find the timesheet you're looking for. You can filter by date range, crew member, open projects, or type in the search box. Remember to turn on the Include Unsubmitted toggle if the timesheet hasn't been submitted yet.
Click on the In/Out times of the timesheet you want to edit.
This generates a popup where you can edit the time. Update the time and then hit Update.
A timesheet that a user is currently logged into cannot be edited from the Web App.
That's it. You've successfully updated a timesheet from the Web App.
Let me know if you have any questions! Drop a line in the blue chatbox thingy.