User Guide updates to Section 4.

doc/CMakeLists.txt

@@ -63,6 +63,8 @@ set (UG_SRCS
 
 set (UG_IMGS
   images/active_stations.png
+  images/Add_Frequency.png
+  images/Add_station_info.png
   images/AstroData_2.png
   images/Astronomical_data.png
   images/auto-seq.png

doc/user_guide/en/settings-frequencies.adoc

@@ -10,15 +10,17 @@ preference; you can modify the frequency table as desired.
 image::settings-frequencies.png[align="center",alt="Frequency Screen"]
 
 - To change an existing entry, double-click to edit it, type a desired
-frequency in MHz or select from the drop down list of options, then
-hit *Enter* on the keyboard.  The program will format your changed
-entry appropriately.
+frequency in MHz or select from the drop-down list of options, then
+hit *Enter* on the keyboard.  You can mark an entry as Preferred,
+provide a descriptive label, and indicate starting and ending dates
+and times for it to be displayed on the band-select control.  The
+program will format your changed entries appropriately.
 
 - To add a new entry, right-click anywhere on the frequency table and
-select *Insert*.  Enter a frequency in MHz in the pop-up box and
-select the desired mode (or leave the Mode selection as *All*).  Then
-click *OK*.  The table may include more than one frequency for a given
-band.
+select *Insert*.  Enter your desired information and click *OK*.  The
+table may include more than one frequency for a given mode and band.
+
+image::Add_Frequency.png[align="center",alt="Add Frequency window"]
 
 - To delete an entry, right-click it and select *Delete*, multiple
 entries can be deleted in a single operation by selecting them before