I'm so confused

Three good places to start as far as the challenge goes are in the Forums -- in the "Book Challenge" forum to be exact. (To get to the forums, click on "Forums" in the bar above.)

Two of those forums that tend to address the mundane and day-to-day of reviewing: "Intro and Rules" and the "How to Add a Book Review . . .".  "The Lobby" is where we socialize (got it's name from the analogy of moving into an apartment building and running into the new neighbors in the lobby).

Just to get a better feel for the community as a whole, the "Cafe Social" forum is where the chatty, talk-about-life things go on.

Back to the challenge.  H/S (shorthand for Harl. Ent. even though it's really Harl/Silh that we're putting there) asks that you read at least 50% of their imprints.  Remember that not all of their imprints say "Harlequin" or "Silhouette".  Lorie made a list somewhere (I'd guess in the "Rules" forum) but a quick and dirty rule of thumb is that if you could buy or could have bought it here at eHQ, it's a H/S imprint.

You should read the "intro and rules" -- it won't take long and we discussed how to handle shorter works (like "minis" or "novellas" or children's books) or books that include more than one full-length book in it (like some of the old "Signature Selects" and all of the old "Harlequin Duets").

KatherineT of the Quiet Canadians did several blog entries on getting around the site and how to do Book Reviews.  The fastest way to find her entries probably is to click on the  Quiet Canadians in the "Tags" cloud over to the right.

Several of us (maybe a lot of us, I don't know) have been frustrated with some of the book reviews not giving all the info that we personally like.  All I can say is, think about what you'd like to see and include it in yours.  For example, I like to know right away who the author and publisher are (and which line/release date in the case of series romance), so I include all that in the "Title" field.  I of course also complete the "Author" field so the author shows up in the "tags" after I post.  I think the system requires it, anyway.  Since everyone has the freedom to do their Book Reviews the way that they want, I'm just hoping that as the year goes on people will start taking ideas from other Challengers.  In other words, I'm hoping that if other Challengers see what my favorite reviewers include, that they'll start including it, too.

Based on my experience the last two years, you'll learn which bloggers you like to visit and which you like to avoid.

Good luck and welcome!

Penn 

Much shorter advice than mine. 

You could also post a question in the reviews that you're interested in and ask specific questions about the book.

Penn