If you want to be less frustrated, stop using these damn poorly coded templates, which even for me, are almost uneditable!
I see what you've done wrong... And my bad, but I've also misguided you in having creating duplicates of the area1 mc... They're not needed.
What you have done on page 4 and on layer4, is add 3 other instances of the area1 mc... You should remove the added ones and only leave 1 instance of it.
Next, do as on page2, select frame 1 of layer 4 and pressing F6, add a keyframe on each of the 16 frames of layer 4...
Selecting each frame in turn, you will then be able to change the text on the area1 mc, without it changing the other texts on the other frames, since there's now 16 different instances of the area1 mc (1 over each picture), rather than a single instance of the area1 mc over the 16 pitures...
Get what I'm saying?
I've attached what the timeline (layer 4) should look like...
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