If you mean your signal lights are stuck in the ON position all the time, check your turn signal/head light switch. Something is probably shorted or worn out in that.

Signal lights blink/flash because of a blinker relay. The signal light bulbs are just regular light bulbs, nothing special.

I think, the blinker relay is mounted on the fuse panel under the driver's side dash.

If it's neither the turn signal/head light switch or the flasher relay, check the wiring to the turn signal bulbs themselves for shorts (or plain old mis-wiring on a previous owners part).