After you make the shuttle join and continue with the next chain you will notice that while the shuttle thread is attached to the picot below, the chain thread just lays across the top of the join. You will see why this is important later. Continue working chains around the central ring, and making a shuttle join into each picot, until you are back at the mock picot you started the round with.Make the last shuttle join of the round into the mock picot. There is only one mock picot in a rose and it's at the end of the central ring.
On the first round of the rose you made the shuttle joins into the picots on the central ring. On the next rows there are no picots to join into. Instead you will use your hook to wiggle under the chain thread that lays across the top of the shuttle join. You may find you have to stretch the chains apart a little especially if you are working in finer threads.
Once you have gotten your shuttle under the chain thread make the shuttle join and continue around the rose.
Each successive row is joined into the top of the shuttle join of the previous row.
If you find that the thread space above the shuttle join is very tight, then loosen your tension as you tat the first stitch of each chain. That will give you a little room for the stitches to move when you do the joins on the following row.
If your tatting is so tight or if you are working in thread that is exceptionally fine you may have difficulty making the joins into the thread above the shuttle join. In that case you may choose to begin each chain with a very, very tiny (almost invisible) picot. This will give you something to join into and at the same time it will keep the ends of the chains neatly in place.
Consistent tension is what will make a nice looking rose. Each chain is slightly longer than the chains of the preceding rows and they need to lay neatly each one above the other. If one round has chains looser or tighter than another round, the chains will have gaps between them or they will overlap one another. If the chain is too tight or too loose when you do the shuttle join, undo the join and straighten it out.Roses can be used in lots of tatting and they are too pretty a technique not to master them.