Edit each employee's profile to make sure you've included wage information. (Edit Employee > Employee Information > Type in Wage) This will matter when you want to track labor costs to an order (you can view this information in the Results tab of the order)
To get started you'll first need to create your Labor Processes so that your employees can choose which of those tasks they're doing!
Settings -> Operations -> Labor Processes
On this page you'll see production lines - all of your labor processes are inside each of those production lines. If you have a fronts line and a boxes line you would likely have slightly different labor processes in each of those lines.
Open the line you'd like to add processes to and you'll see the ability to add categories, labor, the wage attached to each process and whether or not you want that labor process to automatically change the status of the job (e.g. An employee clocks in as cutting out on the saw, you could have that move the status of the order to In Progress. Or if you had a process for loading the truck for delivery maybe you'd have that process move the job to Shipped status).
Once you have that up to your liking, your employees can start using the time tracking system by going to the avatar in the top right hand corner of the page and chose "time tracking".
Then you'll see a module pop up to allow them to choose the job they're working on and what labor process they're doing. They'll be able to choose to either clock in on that job and then come clock back out when they're done OR just enter the amount of time spent. Keep in mind that as you try to pull up the job the system may take a moment to pull up the one you're looking for...
Once you understand this time tracking system you'll likely realize it would be more efficient if you had a computer at each station or machine - and you'd be correct.
To really give yourself the best setup you'll probably want to get some cheap notebook computers to place at each station and then get a scanner so you're team can scan a barcode on your output pages rather than manually typing in the order number they're working on!
NOTE:
As a general rule of thumb, don't make your employees walk more than 10 seconds to a computer. Buy some cheap netbooks for $200 and strap them right to the machines! Track things that matter, things that you're going to measure.
The first is a time card, which basically replicates the time clock you might have hanging on the wall. Employees clock in, clock out, and you pay them for being there. They get paid to go to the bathroom, play pranks, and talk to each other.
The second is a time tracking system that tracks how much time each employee works on a specific order. You can get rich data if your shop is using this tool. You'll be able to tell which jobs are more profitable, see which processes take the longest, and so much more.