Notating ties in this program is easy if you let the software do the work.

Do not try to enter two notes and then tie them together. Instead, enter one 
note and then extend the duration of that note to the desired rhythmic value. 

EXAMPLE: In 4/4 time, let's say you want to tie together a quarter note
     on beat one and a dotted eighth note on beat two. Just enter the 
     quarter note on beat one, then double-click on the newly created 
     quarter note to bring up the Edit menu. From there choose Duration 
     where you can add the dotted eighth note's duration to that of the 
     quarter note.  

OK, this is hard to explain, but here's what is going on:

This program divides each beat into 96 subdivisions, called "Steps".  
So, if you wish to have your quarter note tied to a dotted eighth note, 
you will need to add 72 Steps to the quarter note's 1 Beat in the Duration 
dialog.  The 1 Beat and 72 Steps combine to make the desired "duration" 
of 1-3/4 beats, which the software automatically displays as a quarter note 
(1 beat) tied to a dotted eighth note (3/4 of a beat or 72 steps). 

The software will then handle adding notes that are tied to the original 
(if required).

Here is a chart that explains how this program divides a beat into Steps:

Based on a 4/4 time signature (where a quarter note gets one count and a
measure consists of four beats), the duration values of notes are as follows:

      whole note:         4 beats
      half note:          2 beats
      quarter note:       1 beat (equal to 96 steps)
      eighth note:       48 steps
      sixteenth note:    24 steps

EXAMPLE: The steps for all possible sixteenth note settings in a measure are
         as follows:

      00    "one"
      24    "e"
      48    "and"
      72    "ah"

If a note's duration is extended into the next beat, the software will
automatically supply the necessary ties.

For more information on extending notes, see: 
'Note Duration - Extending how to'.
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