In the leftmost column of key, below [X,theta,T] and above digit key 7 is a key marked with [a b/c]. That is the one to use to enter fractions.
Tu use it, type in numerator, press [a b/c] then type in the denominator. If you want to enter a mixed fraction, use the key as follows
integer [a b/c] numerator [a b/c] denominator [EXE]
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