The Club Manager application is heavily mouse-driven (with the exception of score entry, which can be done entirely with the numeric keypad). Basically, if it looks like a list, right-click on it and a menu of available options will appear. Some options might be disabled, either because the operation cannot be run on the selected item or the operation can only be run on one item and multiple items have been selected, or simply because your level of access to the system does not allow for that operation. e.g. not all users can delete events or members.
You can access this help file from Club Manager by pressing the F1 function key anywhere in the application.