At the end of every post on this blog there is a sharing icon. It looks like this:
You just have to click on the icon for the social media you want to use. For example, if you want to share a post on twitter, click the twitter icon.
Here's an example from my BeyondTheRivers twitter account:
You can retweet from BeyondTheRivers as well.
(For those new to the blog, "BeyondTheRivers" is an allusion to Isaiah 18:1, which explains how Nephi knew he'd have to sail around Africa to get to the promised land.)
Of course, you can also use the Facebook icon to share on Facebook, Printerest icon to share on Printerest, etc.