What is the procedure of changing visa from J to B 2?

Form I 539 and instructions to it on www.uscis.gov will provide all the answers.

You can apply as long as spouse's J1 is valid and your J2 is valid.

You do have to consult with an attorney. It is too bad you do not want to do that. You can apply for I 130, your conviction would not matter....

Is there a way to keep and renew my green card

If you remained outside the US for longer than a year and do not have a good excuse for it, you lost your green card.

Need help?

Possible, if you qualify under all the requirements. You need to consult with an attorney.

Affidavit of support.. using the intending immigrant income?

Most of the times, the intending immigrant income will not be possible to use, unless she was working with a valid EAD. Read instructions to form I...

Can I be deported to Germany even though I have the right of freedom of speech!?!?

Listen, not everything is a "protected speech." The US enforces US laws, not German laws.

How to request fingerprint appointment from USCIS?

It is true. The procedure was changed in April of this year, or about.

A person arrested for DV but was released on the same day and no charges were ever filed now doing Adjustment of Status I-485

the answer would be: arrested, no charges were filed. Take a lawyer with you to your AOS interview. You know, you can handwrite an explanation...

Who has jurisdiction over I-485 application when a NTA was issued but not filed with immigration court?

An excellent question! USCIS does, but they will likely reject it. A limbo sort of situation...