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If you click on your blog in the upper left-hand corner you will see the link "home".

Once you click on "home" you will see a list of Tags and Topics on the right side of the screen. Scroll down to the bottom of the list of topics and click on >Show More Topics

Here is a screenshot showing where to click

tags_and_topics.png

That will take you to a page with all the topics listed on Steemit alphabetically that looks like this.

trending_topics.png

Click on the topic that interests you, read the posts, and begin to engage with people. Hope this helps and welcome to Steemit.