Just substitute the included door handle with one that locks with a key.
Yes it seems like there is something wrong like you suspect. It sounds like you had gotten a product or possibly parts are missing because generally the entire door comes in one piece and all you have to do is just put up the frame and door handle. Go ahead and give them cool call and I’m certain you’ll find out what’s going on.
To accommodate doorways with two entry doors, two storm doors can be installed within a single frame. An astragal kit is required to create a double storm door set-up. Kindly inquire with the nearest Home Depot in your area for more information and on how to order it. - Charmaine
Thank you for your question. Kindly do a web-search regarding mobile home entry doors. Have a good day! - Charmaine
Kindly contact the nearest Home Depot in your area and they will be happy to help you ordering the correct size and model. - Charmaine
The top window is 26" x 27" and the bottom window is 26" x 27"
Thank you for your question. The EMCO 100 Series Storm Door has top stationary and bottom moving window with framed screen. We do not have sliding glass for this door model. For more door information, please visit our website https://www.stormdoors.com/ - Irene
Thank you for your question. We are sorry but the EMCO 100 Plus Storm Door only comes in white and bronze. You may check the EMCO 300 Self-Storing Storm Door that comes in black. For more information, please visit https://www.stormdoors.com/doors/300-self-storing-door/ - Charmaine
Hi. We would love to help you on this question; however the majority of the folks that provide answers on these forums are not employed with Home Depot. Please give your store a call. All questions are advertised nationwide. H.D. has over 2200 stores and your location is not disclosed to us. Every store’s services vary from city to city. Buying, ordering and accessory repairs are not within the scope of this medium to help you. This forum involves folks with experience to answer questions about installing the product they’ve purchased. :-)