Take the whole can, drop the chipotles and adobo sauce in the blender or food processor and puree the whole thing.
You may need to add a little bit of water to get the contents moving freely in the blender.
Then, once it's all blended together, it's ready to use in ANY recipe. I've been using one teaspoon of paste to replace 1 chipotle in recipes, but you may want to play around with it and see if you like more.
For storage, simply keep the paste in a jar with a tight-fitting lid in the fridge. If you don't use chipotle that often, store the whole jar in the freezer and defrost the day before you intend to use the paste by placing the jar in the fridge.
It can also be defrosted in the microwave. Or, place the paste in ice cube trays and freeze for more individual servings. Once frozen, store the chipotle cubes in a ziptop bag.
Notes
About one teaspoon of paste to replace 1 chipotle in recipes