My Portuguese id is lost, I've already called the portugal embassy in germany(well I am living in Germany right now) but they said I have to go back to portugal to get my birth certificate or I can order it through online but I have no idea which site I can order for it.
So my question is can anyone help me to give me the site/ internet address?

Birth certificate is not online merchandise. You should have the original copy at home. Contact your family member who can get access to this document, and have it mailed to you.

If the original copy was lost, get power of attorney and contact the authority to get a certified copy of your birth certificate OR you have to go get this done in person.