number of measures in a song

hi
Im running Irealb on an android device. how many measures can I put in a song?
or how can I add measures to an existing song? I tried to add measures, but I can't.

There are 12 systems (lines) that can be easily edited.
Each line has 16 spaces and depending on where you place bar-lines, each space could be a measure (if it contained just one chord)
In common use with each measure having 4 spaces = 4 per line x 12 lines = 48
If you choose to have 8 2-space measures per line x 12 = 96
The iReal Pro single page format is great for easily readable chord charts of standard AABA jazz tunes.
Longer more complex arrangements may be more difficult (and still have a chart that can be easily followed by the musician)
:))BOB

... following along from Bob's comments:
where your 'cursor' is (touch a space on the chart in Song edit), a barline can be placed on either side of it (touch either the left or right barline button). You might also need to use the Insert button to insert space(s); this moves the measures after your cursor forwards to make room for the new space.
If you want to close up a measure to make more room on the chart overall, you can delete empty spaces in a measure with the Delete button.
e.g. a 4 space measure with two chords (on space 1 and 3) could be collapsed into 2 spaces using the delete button on each empty space (2 and 4).

Sorry for the late answer.
Thank you very much for this useful explanations.
Happy new year !
André

Look at the song Babylon Sisters as an example of how much can be crammed onto one page.