Once you are on your business page, go to the left hand menu. If you do not see “Group” in this menu, then you need to add it in. If you already have it, please skip to the next step. If you do not, then you need to add it by going to the Settings button on the top right. Then click “Edit Page” on the left hand menu. Scroll the screen down to the “Tabs” section. Click “Add a Tab” and then next to the Group section, click “Add a Tab” again. Close and go back to your page.
Once you are back on your business page, click on “Groups” on the left hand menu. Then, click on “Link Group.” Find the group you want to connect with and click “Link.” Then click “Link Group” to confirm. You will now see it on your Group tab as well as hovering over your cover photo.