I have a Dorel convertible car seat with a drop down protector / arm rest, hoiw do I remove that drop down to convert it to a booster?

SOURCE: Lost Manual need help converting to Booster

I called Cosco at 1-800-544-1108 with my model number and manufacture date and they were happy to email the instructions to me in PDF format. I assume they would have sent them US Postal if I'd asked.

SOURCE: Converting to a Booster Seat.

Better yet, please use this manual for clear instructions and dont forget to leave a rating for me. Thanks!!!
http://www.coscojuvenile.com/instructions.asp

SOURCE: I want to convert the car seat to the booster seat

on the back of the car seat you will find a clip that looks like a sideways H. One side of the clip cannot be undone, but the otherside does undo, what you do is indo it and the straps come right out andmake sure to make note of how they come undone so you know for future references. as well as the **** clip, turn the seat upside down and the bracket that is attached to it fits through the slot. And just like that it is into a booster seat...

SOURCE: How do I convert my Cosco car seat to a booster

http://www.coscojuvenile.com/usa/eng/DJGFiles/ProductDocuments/43583340A.pdf

this link will take you to the manual

SOURCE: How do you convert it from a car seat to a booster

Take the base off if it has one, either clips, screws, or a metal rod holding it on. Take the belts out. They should slide off the clip at the back of the seat, then unthread belts from buckles. The buckle/strap between the legs usually has a metal keeper below the seat. To remove you need to bend/twist the keeper until you can push it UP through the seat and remove the belt/strap. It is now a booster seat for use with a lap/shoulder belt in the car. Store all the parts you removed in a ziploc bag for when your child outgrows it so it can be reused.