need information

i buy one iphone 5s new to apple store . this phone 2 years old . me buy this iphone from usa . but my home country banglades. me stay now permantly banglades. bangladesh not have any apple store .this iphone me restore lettest version 8.1.3 . but problem after restore now asked apple id or passworad . this phone my phone or me add apple id passworad . but i forget apple id passworad . but i have full owner information or recipet . when buy this iphone me . need information where i can submit all owner information or which email send me owner information or all recipet for icloud unlock .need apple link or apple email i send full information for icloud unlock . if any one know plz help me . thanks in advanced.