Repetition Time (TR) is the amount of time that passes between consecutive acquired brain volumes. The value (in seconds) is used for slice timing correction and filtering. A specific TR value should be set in the text box.
Alternatively, if the TR value were set to 0 in the text box, the TR information would be read automatically from the NIfTI headers (please make sure the TR information in NIfTI files is correct). The retrieved TR information would be saved in TRInfo.tsv for future usage.