Can I modify users' clock ins/outs?

Plans: Time, Advanced, HR Starter, HR Professional and HR Enterprise. 

Yes! Every employee can request to modify a clock in/out if there is any mistake or if they just forgot to clock in/out correctly. As an administrator, you can also be able to access your employees' clock ins/outs and modify them. It's very easy, go ahead. Go to the employee profile and select the day you want to modify. Do it from "Edit".