This is an irregular verb. It follows the conjugation pattern of the verb ficar.
Present:
A Ana troca de roupa antes de sair.
Ana changes her clothes before going out.
Preterite:
O Miguel trocou os ingressos no balcão.
O Miguel trocou os bilhetes ao balcão.
Miguel exchanged the tickets at the counter.
Conditional:
A Clara trocaria esse detalhe.
Clara would change that detail.