I am trying to sew together squares for an afghan...It says to put wrong sides together and insert needle in b

I assume that the squares are crochet? If they are then you should see two loops (one behind the other) for each stitch across. They sort of look like a "v".

When you put the wrong sides together, the back loops are the ones that are closest to each other in each piece.

Sewing through the only the back loops gives a different look to the front than sewing through both loops.

Check out www.crochetpatterncentral.com for basic information about crochet as well as many patterns to download for free.

when you complete a stitch there are two loops as seen from the top they form a v the back loop is the one that is facing away form you if this doesnt help try looking up learning to crochet or reading crochet patterns

I agree with Marilyn... Use a yarn needle. I crocheted my squares to gather one time ... it didn't look good.