The FIX Library contains the data about FIX point you use in your route.
Data inside:
1) FIX point name
2) Latitude ( ° , ' , " )
3) Longitude  ( ° , ' , " )
4) Magnetic Deviation  ( ° , ' , " )
5) Elevation over medium sea level (feet)
6) Preferred Flight Altitude (feet)

To insert in the Main Destination space
1) Choose 'FIX' from the 'Fill Form' menu
...or
1) Click in the insertion icon on the left of the space the FIX you want to insert, inside the document.
2) The Fix Dialog will be opened
3) Double click on the name of the FIX
...or
3) Select the name and click the 'Insert' button.
4) You can insert all the fix you need moving in the flight  plan using the 'Previous' and 'Next Button', and using the 'Main Dest.' and 'Alternate Dest' Button.
5) If you like you can override the flight altitude over the fix before inserting.
6) Close the dialog.

Note that as you insert a fix, is automatically calculated:
1) Magnetic route from previous fix to this
2) Distance in Nautical Miles
3) Time to cover the distance
4) Total Time
5) Total distance
6) Fuel Data

Of course Data in fix libraries must be correct to obtain correct results...