Click on the point component to select it then press the BMenu button to display the pop-up menu and select the Modify Component command. This will cause the Modify Component dialogue to appear. This is almost identical to the Add Component dialogue shown in Figure 2.3 except that the option menu is missing since you can not change the type of an existing component. Note that the fields contain the current values of the component's parameters.
Change the RA and declination offsets and then click on Apply. You will see the point component move in the editing area as the new offsets take effect. Now drag the point component to a new location with the mouse. Note that the values in the fields of the Modify Component Dialogue are updated to reflect the new position after you release the mouse button.
Now click on the other components in turn to select them. You will see the Modify Component dialogue change to reflect the parameters of the selected component. If you click on the background of the model-editing area all of the components will be deselected and the work area of the Modify Component dialogue will be greyed out to show that the fields are invalid.