These forms are commonly used to allow a spouse or significant other to request school and/or medical records for a stepchild.
Often when a step-parent requests reports cards or medical information, the school or doctor will refuse, responding that it is their policy to release information only to a parent or legal guardian. A valid Power of Attorney overrides their policy and gives you the legal right to access those records. This is generally true even if there is a State or Federal law that the school or doctor's office is citing as the reason or basis for refusal.
The Limited Power of Attorney is a basic form that could be used where the rights granted are intended to give authority to a person to act in a few specific areas. The General Power of Attorney is a comprehensive form that covers almost any eventuality, and essentially gives the holder complete authority to act on behalf of the granter.
Pick either the Limited or the General Power of Attorney form and modify it to suit your particular needs by changing the text where the various rights and provisions are spelled out. Then take the completed form to a Notary Public and have them witness the signatures of both you and the person you are designating as having your Power of Attorney.
Although these generic forms are usually accepted as being legal and binding, and as having the force of law behind them, we recommend you verify that the form you use is binding in your State.