Sao Paulo-Munich-Xangai-Cingapura-Sao Paulo

If you are a Brazilian citizen and your key portion of the itinerary is:

Munich - Shanghai - Singapore

And you don't have additional landings of any kind within the above mentioned destinations, you are definitely eligible for 144 hour visa free transit in Shanghai.

Please, be informed that this is not a "transit visa", but a transit without a visa. There is no visa at all. It is important to use correct terminology, to avoid any possible misunderstandings.

Sou Brasileiro.
Vou entrar na China saindo de Munique e volto para Brasil saindo de Cingapura.
Farei outras viagens de aviao durante minha visita no Sudeste Asiatico.
Ex- Xangai para Bangkok , Hanoi para Da Nang , Phuket para Cingapura etc.
Como devo proceder ao descer do aviao em Xangai? Devo seguir placas indicando onde fazer meu visto de transito ? Muito obrigado por me responder...Thank you.

It is irrelevant how many flights you will have before and after your crucial portion of the itinerary that is, I will repeat:

Munich - Shanghai - Singapore

So, your flights Munich to Shanghai and Shanghai to Singapore have to be nonstop. Everything before Munich and after Singapore is irrelevant and really does not interests Chinese immigration authorities.

You will print out your flight tickets and have those printouts with you. There has to be a 14 digit number (this is a flight ticket number) visible on your printout for each of your flight tickets. You will declare at check-in in Munich that you will travel to Singapore via Shanghai using 144 hour visa free transit. After a short inspection, you will be allowed to board the plane.

Upon your arrival in Shanghai, you will follow the signs and you will reach 144 hour visa free transit counter where you will fill out a blue form. When you are done with it, you will hand over your documents to Chinese immigration authorities and after a short inspection, you will get a stamp in your passport (for free - there is no charge) and you will be allowed to exit the airport.

Basically, this is it.

Agora entendi...Acredito que serei capaz de fazer isso sozinho,nao parece ser dificil. Muito obrigado.
.
Now i understood.i think that i can do it alone ,not looks to be dificult. Many thanks .You helped me a lot.

You can do this perfectly by yourself. This is just a formality. One more detail... It is advised that you have a booking t least for the first overnight in Shanghai because when you will fill out the blue form at 144 hour visa free transit counter, you will encounter several questions regarding your accommodation. This is it.