Hi.
All Wirral Line services are starting and terminating at James Street from 6th-8th July (tomorrow 'til Sunday), which is why no connection is shown.
The walk is easy. Use the 'Moorfields' exit (not Old Hall Street), turn right onto the main road, walking with the traffic until you reach the town hall. Turn left, walking towards the law courts, and James Street is the road at the next set of traffic lights. It takes me 5 minutes and will take you 10 mins max.
Yes, the rail replacement buses are still operating, as well as additional services between James Street and St. George's Hall - which makes no difference if travelling from Moorfields.
It's also worth notiing that Ellesmere Port services will only operate between Hooton and Ellesmere Port, with Chester trains strengthened to 6 cars, enabling passengers to connect at Hooton.
As for fares (as we're in the Fares section?) a ticket to either Moorfields, James Street or Lime Street will print as LIVERPOOL STNS.