I have fixed everything, but my website doesn’t show the secure lock / even though it has SSL on. I even checked it on SSL checker they told me you should dm ssl providers.
You are loading your site in HTTP. If you load in https (https://marblerp.com) it will work fine. See the article below on how to force this for all your visitors.
I checked the website and it seems that your theme is including jQuery from http://code.jquery.com/jquery-3.3.1.min.js. It’s hardcoded to http instead of https. And for security browsers will not load HTTP assets on a HTTPS website.
Please change that URL in your code to https to fix this.