Do I need a visa to Hong Kong with Somali passport?

Yes, visa is needed, you can submit application directly to HK immigration department (Receipt and Despatch Unit, Immigration Department,
2/F, Immigration Tower, 7 Gloucester Road, Wan Chai, Hong Kong ), or
send it to Immigration Division of the Beijing Office of the Government of the HKSAR at 71, Di'anmen Xidajie, Xicheng District, Beijing 100009.

Please send me the hk office in Beijing in Chinese handwriting, I stay in Tianjin n am planning to go to Hong Kong on 15. reply soon, thank u

Name: 香港特别行政区政府驻北京办事处
Address: 北京西城区地安门西大街71号