for understanding plesk panel step by step i was scratch my head from hours ..... but i find this guide i hope it will work
https://docs.google.com/viewer?a=v&q=cache:ZPP1EcgeE3UJ:https://help.fasthosts.co.uk/app/answers/detail/a_id/1602+&hl=en&pid=bl&srcid=ADGEEShpSO7P1xnh1bovdk53kk24ssg7on-lQVSnIVKOP0UEq6ZSDYkU_TfrldocTzC9V37Gr08b38G7Y9tvYxg0MWy22VqVzE7I6zaKOl2DDSIVH4hCydQHu7oiRe9TfpgaDx7ZMhiG&sig=AHIEtbQuhFuutFyrntB85lyTJRxgK20WKA
https://docs.google.com/viewer?a=v&q=cache:ZPP1EcgeE3UJ:https://help.fasthosts.co.uk/app/answers/detail/a_id/1602+&hl=en&pid=bl&srcid=ADGEEShpSO7P1xnh1bovdk53kk24ssg7on-lQVSnIVKOP0UEq6ZSDYkU_TfrldocTzC9V37Gr08b38G7Y9tvYxg0MWy22VqVzE7I6zaKOl2DDSIVH4hCydQHu7oiRe9TfpgaDx7ZMhiG&sig=AHIEtbQuhFuutFyrntB85lyTJRxgK20WKA