facebook posting to groups

Hi there , I have a personal account with facebook and have now just done a buisness page but if I go on a group ie facebook one stroke group any postings I make do so under my personal page and not my buisness. Does anyone know how to join a group or post under your buisness page. Am getting every frustrated at trying everything. Please help if possible . Thank you in advancex

Sorry, you cannot post on a group or join a group under your business name if it's a page. A page can only interact with other pages or on their own wall. If you see other people posting under their business name, it's because they have created a personal account with their business name, not a page.