good afternoon if I already apply and everything but I want to change the position can I do it?

If you’re hired and trained in a position you have to wait 6 months- 1 year to be able to transfer to another position

if I have a transfer and I already start training, what I can do to come back in the location I was before?

Actually if you get through to an interview you can talk to the recruiter about a position your more interesed in. I did and was placed where i wanted to be.

No. You can only apply once in six months. Once submitted you can not apply again for 6 months