Mindtalk has an easy way for you to share content from any website to Mindtalk page. It is called Share Button. Basically, Share Button is a button widget for many types of website, such as blog, news portal, etc.
Add this following code in your website. Either put it in header, or at the bottom of body element.
And then, put this following code in the part where your Share Button will be appeared.
<dg:share-button data-class="simple">Share to Mindtalk!</dg:share-button>