Every fixture can be moved after it has been generated. Only the tournament Owner and an Administrator can do it; everyone else sees the read-only public page.
Moving one fixture
Open the tournament and select Schedule.
Find the fixture. The bottom of its card has four cells you can change: the date, the kick-off time, the pitch and the referee.
Select the time. Choose the hour, the minutes and AM or PM.
Select the pitch cell and type a pitch number.
Each change saves as you make it. There is no separate save button.
Moving several fixtures
Select SELECT MATCH TO UPDATE on the group.
Tick the fixtures you want. The button counts them.
Select UPDATE SELECTED MATCHES. It opens the same dialog BULK MATCH UPDATE does, but it only changes the fixtures you ticked.
Rolling fixtures onto the next day
A group that will not fit into one day can spill over into the next.
Select BULK MATCH UPDATE on the group.
Set the Match date and the First match start time.
Set Last allowed match start time. Nothing will be scheduled to start after it.
Clear Same start time per round, then set Duration and Time between matches.
Select Update Matches.
What you will see
Fixtures fill the first day until the next kick-off would pass your Last allowed match start time. The rest move to the next day and start again at your first start time. Two matches a day, then the next day, and so on.
If it does not work
You want to delete a fixture. You cannot. A tournament fixture has no delete or cancel control. The fixtures come from the group, so removing one means deleting the group - see "Editing and deleting a group in a football tournament" - or changing the format, which rebuilds the whole list.
The pitch cell will not open. Select it once, directly. It turns into a text box.
Everything landed on one day. No Last allowed match start time was set, so nothing was pushed over.
Every fixture now starts at the same time. Same start time per round was left ticked. See "Why two football fixtures clash, and fixtures showing only one team".
Nothing saved. The dialog needs at least one field filled in.