RepeaterBook enters all data from the perspective of the remote (user) radio, not the repeater.
To reduce confusion as to which frequency is being referenced in terms of a paired frequency set (duplex with separate input and output frequencies, as repeaters, typically use, the uplink frequency refers to the frequency that the repeater is receiving on. This is the frequency that is programmed into the user radio (HT, mobile, base) that you transmit to the repeater. This is the radio's transmit frequency. Some radios are equipped with automatic repeater offset/shift so the user does not actually program in a transmit frequency but simply indicates if the repeater has a positive (+) or negative (-) shift.