After you have locked a project the scheduled line items will stay blue until you turn these into bookings by clicking on the line item, clicking on the side bar and choosing booking, add booking - using scheduled days. This line item will turn red indicating a booking has been made.

To send an offer of work to a contractor, click on the line item and select assign a contractor from the sidebar. Type in the email address, name, and whether they need daily timecards or not… they will be sent an email inviting them to work on the project at the budgeted rate and for the days/weeks booked. They can choose to accept or decline the offer.