Do you mean particular user accounts you know? To view their posts (lumped in with their resteems, with no way to filter them unfortunately) on Steemit, you would visit https://steemit.com/@theirname
For finding people posting about certain topics, try the search function at the left-middle of the top of the page on steemit.com.
Cheers pfunk, but the only search function I've found so far takes me out, to google. So I'm dumb, that's good! It gives a knowledgeable one the opportunity to write a series of blogs for the absolute newbie. No where have I found anyone explaining 'to a simpleton' HOW to use the site best. Not How the mechanics of site work, but how to navigate, to follow, curate, witness. They are all words that seem to have meaning, but no indication towards their substance, no, 'how to'.
Thank-you.