You don't just import the information and have it auto-create profiles for everyone in the file. You have to go through the compare process, to ensure that those people in your file don't already have existing profiles here on WikiTree. Once the compare process is done, I believe add buttons should show up.
For better assistance regards a ged-file import, if the links already provided here don't help, I would suggest you ask your own, new question, instead of tagging onto one almost 5 years old.