The sensor pod should stay attached to your skin using its own adhesive.
First:
1.) Make sure that your skin is clear of any cream or lotion before you attach the sensor pod.
2.) Be sure that you first cleaned the area with alcohol wipes and that the area is clean and completely dry before you insert the sensor. Do not leave any substance on the skin where the needle inserts. If the patch still peels up, you can use medical tape such as Blenderm, Tegaderm, IV 3000, or 3M tape for extra support.
Caution: If you use tape, only tape over the white adhesive patch on all sides of the sensor pod for even support. Do not tape over the transmitter, over any of the plastic parts of the sensor pod, or under the sensor pod.