Where are the screws for the front flasher located. need to change bulb

you did not say what make or model. If the back bulb is flashing it is the front which may be out, in this case maybe front bulb fuse. Google make and model plus add fuse box diagram and you should find the location of fuse and relay that way. It would be unusual for two bulbs to go out at the same time.

The flasher is under the dash.If you turn on the signal listen for it's location.Turn on your 4 way flasher and see if the left rear light is flashing.If it's not then replace the bulb.If it still does'nt work after replacing the bulb check if there is power to the socket. Use a probe light.If no power to the socket.There is a break in the wire or worse the signal switch may be the culprit

you will need to inspect all of the left side blinker bulbs one of the bulbs that is supposed to blink is bad my buddy has a caviler that had the same problem one of the bulbs ended up being bad it was the rear drivers side bulb. there is also a flasher relay locater under the dash that tends to go bad just listen for the ticking and replace the flasher the flasher costs about 8 bucks at you autopart store ask for a flasher relay. i hope this helps.

You need to change the flasher unit. Usually a silver squat cylinder with a 3 prong connection.
Consult your owners manual for the location of the flasher module. It is likely under the dash maybe clipped the the body / frame work there. Note that here are usually 2 of these. one for the signals and one for the hazard flashers.They are interchangable. These are only a few dollars at any auto parts store.

You say it's the right turn signal that is malfunctioning. If the left works correctly, then the problem is most likely NOT the flasher unit. That unit provides the flash for both left and right signals. I think that flasher unit is mounted on your steering column, down under the dash. It will probably be an aluminum cylinder, but may be a rectangular black plastic block. Before you change the flasher unit, I'd suggest checking the front and rear turn signal light bulbs. On the front, those are the parking light bulbs, and on the rear are the stop light bulbs. You may have a poor connection, probably from corrosion, or the bulb is very nearly burned out completely. Good luck.

Flashers and Relays REPLACEMENT Pickups The hazard warning flasher, on the pickup, is located to the left of the steering column, beneath the instrument panel, and is secured by a clamp and one screw. To remove it, simply unplug the electrical connector, loosen the screw, and slide the flasher out of the clamp. The turn signal flasher is located to the right of the steering column, beneath the instrument panel, and is secured in the same way as the hazard flasher. The turn the signal relay is located to the immediate right of the hazard flasher, and is secured by two screws. To remove it, unplug the electrical connector and remove the screws. MPV The relays and flashers are located under the dash, near the fusebox. Navajo Both the turn signal flasher and the hazard warning flasher are mounted on the fuse panel on the truck. To gain access to the fuse panel, remove the cover from the lower edge of the instrument panel below the steering column. First remove the two fasteners from the lower edge of the cover. Then pull the cover downward until the spring clips disengage from the instrument panel. The turn signal flasher unit is mounted on the front of the fuse panel, and the hazard warning flasher is mounted on the rear of the fuse panel.

Obviously your Flasher is defective or one of the Lamps is intermittent. Federal Law requires the Flasher to quit Flashing if a Bulb is Burned Out or the Circuit to either front or rear has an intermittent connection. Next time it Stays on check the Front Bulb for the side you are indicating a turn. If Both Front and Rear Bulbs are lit then replace the flasher. Flashers do wear out!

Fastest Robe

possibly one side of your signal flasher is out turn on emergency flashers to locate one flasher then you can locate the other

When you select left or right do any of the bulbs come on? If you select left check front and back left side if one of the bulbs did not come on the flasher will not work. Change the bulb that is out. Same with the right. If the fuse for the turn signal is good (check fuse or replace do not use visual, some appear to be good but are not).
The emergency flasher is different from the turn signal flasher. Look at manual for location of turn signal flasher. If you manually lift and lower turn signal control you may hear a clicking under the dash to locate the flasher.

The problem is most likely not a bulb and certainly not a fuse but the 'flasher'. The flasher is located under the driver's side A/C duct above the fuse box. It just plugs in so you shouldn't need any tools.