Hey,
Either would do. But you cannot walk in as they probably won't allow applicants to attend personally. The requested documents (passports, photos, etc.) should therefore be sent via courier. Send the
VAC (VFS) in turkey an email or call them as soon as possible and ask for further instructions; they will tell you what to do next. Please Be certain that it is allowed to walk-in before doing so. Which country have you applied from? or I should rather ask in which country does your spouse currently reside?