When employees leave your organisation you can Archive them (which retains their record) then Delete them (which completely removes all trace) as follows:
USERS > Select the User Concerned > Then find the 'Archive User' link as follows:
When you archive a user you'll be asked for a Leave Date for record keeping purposes.
Once archived the User/ employee will no longer be able to access Timetastic, their leave data is however retained for your records and can be viewed again by clicking on the 'show leavers' checkbox on the USERS page.
If you want to completely delete their record you'll need to first locate them in your USERS list by selecting the "Archived Users?" select box at the top left.
Select the user and you'll notice the 'Archive User' is replaced by 'Permanently Delete User'.