When you want to put another ball into an over, there are two choices:
a) Press “Edit” and highlight the ball in the over that you want to amend, in this example ball 0.4:
In this example you have had to change the ball from 1 run to a non-ball, and want to add a ball after it. Right click on ball 0.4 and select “Add Ball”.
This will add a ball after the line. Remember to amend the runs/extras for this ball
b) You want to insert a ball before ball 0.4. Right click on the line and select “Insert Ball”. This will turn the former ball 0.4 into 0.5. Remember to amend the runs/extras for ball 0.4