istalling Diono Radian RXT

Im so confused..there so many darn straps in the back..i dont see anything about them in the manual..it seems that they are Latch straps for the latch installation and the othesr..idk backpack straps?? ive gone thru the instructions but it doesnt say what to do with them. i dont think im suppose to just leave them there..iif i install using the seatbelt..do i need to remoive theses..im sorry..im just so confused..

Did you try to youtube it?