Question: EpsilonDelta Maplet - Unable to enter epsilon or delta values in field

Working in Calculus Study Guide which uses EpsilonDelta maplet in examples and problems. Study Guide says to enter epsilon and delta values in fields at right, or to use sliders. Sliders function for rough work. However, fields displaying vlalues are grayed out and do not accept entries. Difficult using sliders to get precise small values. Is this a program error or something I am overlooking? Thx.

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