If you are a non-billing administrator, you can skip this section, but make sure to read the Entering Hours for Your Worker section, so you have an idea of how a worker enters hours.
Entering your hours is as easy as clicking the Time&Sales tab and starting from the top of the screen, pick your client, the project (all clients have at least one project called Miscellaneous), the date, the amount of hours, and a description. Click the Record New Hours button and you are done. You will immediately notice that your hours entry appears in the Daily History Hours tab.