To check out candidates manually (for example you have confirmation over the phone), you can use the Shift Dashboard to check out the Candidate.
Open the Shift Dashboard page and locate the Candidate you wish to Check Out.
Click the Check Out button and confirm the time they finished their shift (this will default to the end of the shift):
The action of checking out will automatically enter the details into the Timesheet and log the number of billable hours for this shift as the total hours worked so you do not need to confirm the hours for the timesheet as Tracker already knows this.
This is then confirmed in the Hours column in the Shift Dashboard: