Hello @AnnM172 ,
I was just in your account and was able to get all the way to the page for list selection/creation with the blue Upload button. Check to make sure you don't have multiple columns for email addresses, if the issue is that you can't select the column you want while that field is already claimed by another.
Otherwise it may be a connectivity issue on your end. If none of those connectivity troubleshooting steps alleviate the issue, could you please provide a screenshot of your speed test, including the More Info section? Once we have that we can do some more advanced troubleshooting as needed.