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Hi! So sorry to hear your Mac is messed up by a malicious browser hijacker. To completely get rid of Genieo Toolbar malware, you need to remove all its software, add-ons and files. But you should know that this malware can change its files and location in the system. As it can bypass the detection and deletion of antivirus, I recommend that you remove Genieo Toolbar manually.
As gbcorb said, don’t use their uninstaller! It’s a pain to get rid of Genieo, but you definitely don’t want to leave that malware on your MacBook. The Safe Mac website that was mentioned has a very thorough guide to remove Genieo. Follow the directions carefully, and you should be able to rid yourself of it.