Start with documentation.
To connect records with TimeTable for Frontend-Reservation you have to put following code on a code2 section on a hidden page and put in the URL in the settings of the timetable page, you want to connect:
$oRRF = records_feform::getInstance();
$iSectionID = LEPTON_core::getValue("section_id", "integer", default: 0);
$iPageID = LEPTON_core::getValue("page_id", "integer", default: 0);
echo $oRRF->display_form($iSectionID, $iPageID);