Normally, most would prefer walking to reach Marymart from Robinsons Place Iloilo (Main) because this is only a block away. But considering also people who prefers to take a jeep, here are the possible jeepneys to ride.
The most idea is ROUTE # 4 UNGKA-ILOILO CITY VIA DIVERSION FESTIVE WALK TRANSPORT HUB LOOP. You can ride this jeep from Mabini wing (KFC/SNR exit) because this jeepney will take you to the main entrance of Marymart. No need of too much walking.
Alternatively, you can use the Ledesma wing (J.Co exit) and take any of the jeepney listed below. You can drop by Ong Bun Pension House. Beside that is an alley that will take you to the entrance of Marymart.