Place your cursor over Reference Data and left click on the sub-option Agencies.
To navigate between pages of the table you can either use the 
button or use the drop down list 
to choose the page you would like to view.
Find the agency that you would like to edit and left click on the Edit button 
on that line.
Enter the changes that you would like to make to the information.
Use your Tab key on your computer keyboard to navigate through the fields or left click on each individual field.
Left click on the Update button 
to save the edited information.
Left click on the Cancel button 
if you do not wish to save.