Unhappy [Q] [HELP]CAN'T connect my MTS to my Zebronics Tablet

HEY ,I have a Zebronics Tab ,i couldn't connect my mts modem via otg cable ,and I couldn't even add APN manually ,i saved the APN but it always showing empty CLEAR FIELD without even a DEFAULT APN OF MTS but toast message shown that usb device PLUGED In and OUT

So Please help me,HOW can I do it ??????????????????????????????????????????????????