If it is the same as my BT Freelance XA3000 then:-
a) Press and hold the SKIP button on the base unit until the current setting is announced, then release.
b) Press and release the SKIP button to move through the settings, with each press the options will be announced and will be shown on the base unit display, ie. 8,9, Time saver, 1,2,3,4,5,6,7.
When you hear the setting you want, do not press the SKIP button again. After a short delay your chosen setting will be announced.
Hope this works.