Summarize the following:
When doing stretches to help your Achilles tendonitis, it's a good idea to do them every morning. Stretching the calves then will help prepare your Achilles tendon for weight bearing throughout the day. Try doing the stretches right when you get up out of bed, as the achilles tendon has likely been contracted all night and will need some care when being extended once again. Stand up and put your hands against a wall. Move one foot in front of the other so that they are about hip distance apart. Place your front foot close to, but not touching, the wall. Bend your front knee slightly while keeping your back leg straight. This should stretch the calf of the straight leg effectively. Be sure to repeat this stretch with your legs in the opposite position so both calves get stretched. Stand up and put your hands against a wall. Put one foot in front of the other, about hip distance apart. The toes of your front foot should be close to the wall but not touching it. Then bend both knees, moving your whole body into a slight crouching position. Your back should be close to straight while you do this stretch.  Hold this stretch for a few seconds and then release it. Repeat the stretch with the other foot forward. Stand up and put one of your feet on a step that is a few inches tall. Position the ball of your foot on the edge of the stair so that your heel is hanging off the step. Bend your foot at the ankle so that the Achilles is stretched out and the heel is lowered slightly.  If you don't have a step you can use, you can put your toes up on a wall and lean towards is slightly, stretching out the calf and the Achilles. Don't lock your knee while doing this stretch. Keep it just slightly flexed, so that you don't overextend your knee.

Summary:
Stretch your calves first thing every morning. Do a standing calf stretch. Stretch your soleus. Do a foot flex stretch.