You could tap on the first beat of the bar needing the extra beats and assign it a 6/4 time signature (if you have more than one chord in there, you might have to move the others around for the correct playback timing of those chords.) Or you can use the following bar as a 2/4 (it could still be 4 spaces wide.)
Also the next bar it continues on to will need a 4/4.
You can use the Insert button a few times (the blue+ arrow under the Text button) to add extra space for your 2/4 bar which will move the following bars forward.
Also any space can have a barline assigned to either side of it if you need to create extra bars.