Crochet/amigurumi: joining two pieces
&quot;Rnd 11: Join legs as follows: Ch 8, sc around the 9 sts of first leg, working in ch 8, sc 8, sc 9 sts of second leg, working in front loop only of ch-8, sc in next 8 ch - 34 sts.&quot;

Here are the instructions broken down into separate steps. In parentheses at the end of each step is how many stitches you should have created since the start of the first step. The new stitches added in the current step are in bold.

Chain 8
8 ch

Place 1 sc in each of the 9 stitches of the first leg
8 ch + 9 sc in first leg

Single crochet 8 in the starting ch 8* that you made in step 1.
8 ch + 9 sc in first leg + 8 sc in ch8

Place 1 sc in each of the 9 sts of the second leg
8 ch + 9 sc in first leg + 8 sc in ch8 + 9 sc in second leg

Working along the starting ch8 again, place 1 sc in the front loop of each ch
8 ch + 9 sc in first leg + 8 sc in ch8 + 9 sc in second leg + 8 sc in front loops of ch8


*In step 3, be sure to work each single crochet stitch into the corresponding chain stitch, rather than just working them into the loop formed by the entire chain. That way you will have access to the front loop of each chain stitch when you get to step 5.
Here's a sketch of where these steps will fall on the actual body of the toy. The ch8 forms the start of the crotch. The next round will almost certainly be to work sc in the top of the first leg, then along the line of sc in the ch 8 from step 3 above, then around the sc of the second leg, then along the other side of the ch8 in the sc in front loop from step 5.