You can modify clocks created by clocking wizard using Manage IP option from IP_Manager sheet. To change clock frequency and other features, select the clock name and click Edit.
Figure 1. XPE IP ManagerYou can modify the clock you created using the Edit Clock button in the clock sheet by selecting the clock name from the Select Clock drop-down list and clicking Edit. You can also modify clocks using the Manage IP option from the IP_Manager sheet.