How to apply for AP and How long does the process take in San Francisco area?

ss01

Registered Users (C)
I am planning to apply for AP on my own. I already recieved my EAD. Which all documents do I need to apply for AP. Can I walk-in at any office near to San Francisco? And How long does this take to get AP?
Please let me know? Thanks for your input and help.
 
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