To edit a breakpoint visible in the source, position the cursor on the breakpoint and proceed as described in Conditional breakpoints or Printing breakpoints.
Where you wish to change the Conditional or Printing properties of a breakpoint without finding it in the source, choose Edit... from the Breakpoint Options menu. Select a breakpoint in the Breakpoints list and click the Edit... button. Choose the Conditional or Printing tab as appropriate and proceed as described in Conditional breakpoints and Printing breakpoints.