It literally translates to:
* yo: I
* siempre: always
* quiero: want
It's a common phrase that expresses a desire that persists over time.
To use it in a sentence, you can say:
* Yo siempre quiero comer pizza. (I always want to eat pizza.)
* Yo siempre quiero viajar a la playa. (I always want to travel to the beach.)
* Yo siempre quiero ser feliz. (I always want to be happy.)