Take ICBC as an example. Take your card and ID card and go to the bank counter for overseas remittance on weekdays. Ask your friend about his account name (in English), card number, SWIFT (Wells Fargo is generally WFBIUS6SXXX or PNBPUS3NNYC) or ABA number, and purchase foreign exchange (RMB for USD) at the ICBC counter. Then fill out the application form for overseas remittance, and choose PNB as the clearing account bank (2 items). As long as your friend's account name and account number are OK, it will arrive as soon as possible (the next day if it is slow).