One reason why the turn signal will not stop blinking is the clock spring. This is something that many people replace themselves. Another possible cause of this problem could be the switch needing to be replaced.
If it's just one way and it wont shut off then its probably just to turn signal switch.
turn signal relay fuse
That means its broke.
One of four things can cause a turn signal not to work. Either the turn signal switch assembly, a bad bulb, a bad fuse, or a bad turn signal flasher.
it sounds like a bad flasher which is directly behind the switch/button that is used to turn four ways on
Change the front turn signal light bulb. It's bad.
multi function switch( turn signal, lites etc)
replace turn signal flasher, hazard flasher is separate
Check for a bad socket Turn signal flasher? Switch at steering column?
Replace the flasher relay.
You could have a faulty bulb. Check for contact in both bulbs if they are new.
Check the fuse, check the bulbs, check the flasher relay.