This is the error message that I got. What practical steps can I take please?

1 Error to Resolve
Note from Reviewer
Your navigation menu button does not work nor display when we test your website on the Free Basics service. This is most likely due to its reliance on JavaScript, which Free Basics does not support. The following is a link you may use as reference for creating a navigation menu that does not use JavaScript: http://www.sitepoint.com/pure-css-off-screen-navigation-menu/ . Please make this revision and resubmit for approval.
Your site functionality relies on Javascript.
Please update your sites functionality to work without Javascript. The Free Basics proxy doesn't fully support Javascript, meaning that your service may become non-functional.

Gurus in the house, please I need practical steps to resolve this. Thank you.

@ seun, lalasticlala can you please put this on front page for me? Others may also be searching for solution to this. Thanks.