Hyundai wiper arm not working

Try this test. With the key OUT of the ignition stand outside the vehicle, reach out and try to move the broken wiper blade by hand. Does it move with no resistance? Does it feel like 'clicking' as you move it? Does the other wiperblade move slightly as you move it or does it not move at all?
This will help work out if it is the wiper arm slipping on it's drive spindle or if the problem is deeper down underneath in the rods and arms moving the wiperblades. Please comment below with this information and I'll try to help you more.

arm/linkage came loose.. its at the base of the windshield..

Hyundai started using plastic washers to hold down wiper arms. This is to prevent damage to the wiper transmission in cases where the wipers are either frozen to the windshield or trying to push too much snow/ice. To remove the wiper arm, you will need to locate the washer and remove it first. Chances are the washer will be the only part you need to replace.

Remove the wiper arm by taking the nut off the end of the post coming through the base of the wiper. turn on the wipers and if the little post is turning back and forth with the other wiper, then you need a new wiper arm. the little serrations on the inside of the arm's base get stripped, usually from turning the wipers on when they are stuck to the windshield by ice. if the little post is not turning then you need a new wiper transmission. you will need a repair manual for that.

lift teh plastic cover up and tighten the retaining nut

the wiper transmission which is also know as a linkage is stripped out

Most likely it is the linkage between the driver and passenger blade arms. The easiest way to find out is to remove the cowling and look...you should see the wiper motor, the motor arm that links to the driver arm and the linkage between the driver arm and passenger arm...this is held together by a plastic clip and that clip is most likely going to be broken when you look...it's fairly easy to replace.

check to see if it is stripped out where it goes onto the arm,or if a bolt has come out of the arm assembly

the wiper arm is bent

there is a 15 amp fuse for the rear wiper under the bonnet check this, also i think the accent has a seperste switch in the dashboard for the rear wiper like th hyundai coupe.