Will try to add it again.
Oops... I forgot to add 1 more issue. For some reason in some save files values are not set so like in 1 file everything is set (health, missiles, etc.) but in another health isn't set but everything else is. Idk what the game does to screw up the saves like that, but if you cant set something then try reaching the next save point and then try to edit it.
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@jm_plata after viewing your image, I got a question, does the save you are editing really have 999k max hp? or is that what you want to set max hp as? because if that's what you wanna set then input your current max hp into the box under the label "Cur. Max HP" and the amount you want to be set into the box under the label "Edit. Max HP"