Plain Text Using Yahoo

Now I have BT broadband, I use Yahoo for e-messages. I have noticed recently that I can't change the format to plain text, whichI need to be able do occasionally when contacting group lists. Can anyone help me solve this puzzle please?

Perhaps I should have explained that when I click on the option of plain text, a message appears at the foot of the screen saying 'javascript:Switch' and this is followed by an upright oval outline.

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