Hi @ashishsainiofficial
I wouldn’t really suggest trying to edit our buttons to custom ones. Some providers, like Google and Facebook have very specific branding guidelines:
– Facebook: https://developers.facebook.com/docs/facebook-login/userexperience/#buttondesign
– Google: https://developers.google.com/identity/branding-guidelines
If your button doesn’t meet these, if either Google or Facebook would need to review your app for any reason, the review would fail because the button doesn’t match their guideline. A failed app review can cause the app to be shut down until the issue gets fixed.
So I’d rather recommend using our buttons that match their guidelines.
If you’re willing to take the risk, then you can write your custom button’s HTML markup to the provider > Buttons > Default button or Icon button field, depening on what you want to customize:
https://nextendweb.com/nextend-social-login-docs/buttons/
If you just want to use a simple image as your button, you could upload the image to your site through the WordPress Media Library, grab its link and use the HTML img tag:
https://www.w3schools.com/tags/tag_img.asp
to display it.