Is it possible to choose my primary care physician if I don't like the one I've been assigned to? And where can I request regarding this matter?
You will need to talk to your health care team leader or to the patient advocate at your VA medical center to take care of that
This makes me think of applying the documents and information.  Could you please tell me how I can apply in person in Spanish?
Para llenar su solicitude en persona, encuetre el Centro Médico de Veteranos mas cercano o reciba ayuda por medio del Departmaneto de Veteranos de su estado.