You can a few options to finish the drying process. If you live in a warm, dry climate you can lay out in the sun. Ideally they should be laid out on screens that will allow airflow around the chipotles.
You can use a food dehydrator to dry your chilies. There is one draw back to this though. The smoky flavor of the chipotles will soak into the surfaces of your dehydrator and can leave it with a smoky flavor for days, or even months.
Lastly you can finish off the chipotles in your oven. You are going to get a great smoky flavor in your house for a day or two but it won't be too bad. Set your oven to a very low temperature (below 200 degrees F) and spread the chipotles out on baking racks. You don't want them just sitting on a cookie sheet or they won't dry as quickly.
Dry chipotles until they are completely brittle.
