Sticky Secondary Menu instead of Primary Menu

I checked by removing the code. No interference detected. Checked the new code again and again. Still no new hook detected.

Once you added the code and click Execute PHP your navigation logo should show up.

It's getting consfusing. I added your mentioned code in function.php file. After that I can't see anything new. Neither in the hooks, nor anywhere else.

Can you provide a link to your site?

http://www.elearnee.com

Hmm I currently don't see a secondary navigation?

Sorry not to mention, I disabled secondary navigation on my home, about and contact us page. You can check on remaining ones.

Still don't see it: https://s1.postimg.org/xo6xb1jlr/2017-07-02_1003.png

This is my contact us page. I already mentioned I disabled secondary navigation on home, about and contact us page.

You inserted the website URL: http://www.elearnee.com in the code.

It should be the URL to the navigation logo image.

Yeah I inserted this URl

You just inserted the URL to your home page: https://www.screencast.com/t/a3wBhd13

It needs to be to an actual image file.

For example, your primary navigation logo can be found at this URL: https://www.elearnee.com/home-tuition/wp-content/uploads/sites/10/2017/06/elearnee.png

You need to be able to add the URL to your browser and have it take you to the actual image.

Great! I can see the logo now on my secondary navigation. What's next?

My logo is positioned at the center of secondary navigation. How to customize it?

Try this CSS:

.secondary-navigation-logo {
    float: left;
}

Then you can change the navigation width and inner navigation width in Layout > Secondary Navigation.