In order to change the time that you are doing a job, you can follow this procedure:
Go to Visits -> Compact View -> filter for a specific Patient and then select View -> click on the times of the visits you want to change and you can change them within the page.
If you change the start time, it will nudge the visit to another time. If you change the end time it will edit the duration.
If the visit is a repeating visit, it will only change this instance of it. So, if you have a visit that normally occurs 12.00 - 13.00 and you change Wednesday's visit, all the other visits will remain at 12.00 - 13.00.