brp information

hello all, i am in possession of an eea family permit, i am now in england. ild like to being applying for a loner stay. my visa expires in October. I have done some research and I understand that I need to do biometrics and (fingerprints and photos) first.  I went to a local post office and was told I need a letter from the home office. How do I get this letter?is it sent automatically to me to an address I provided during my application? how long after I have arrived in the Uk is this letter sent to me? Thanks for anyone who helps

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