This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
A Ana solta o cachorro no parque.
A Ana solta o cão no parque.
Ana lets the dog go in the park.
Preterite:
O Miguel soltou os balões no céu.
Miguel released the balloons into the sky.
Conditional:
A Clara soltaria o pássaro se pudesse.
Clara would release the bird if she could.