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When you say yahoo basic do you mean free yahoo version or paid version or is it the format of yahoo email page that got changed?
Note: - Please reply using the box below.
If its just the email page format that you are trying to change please then there is a option to switch to newest yahoo email on the top right of the yahoo email page like shown in the below image click on it.Please try it and let me know the result.
If that didn't work please let me know and we can try other options
If it worked Please rate me using the rating options (stars) on the top of this page, select the rating and click on submit. If it didn’t work please let me know and we will try other options. Have a Great God Blessed Day. If you need any help in the future please use this link to ask for me http://www.justanswer.com/computer/expert-john/