Ah, I thought I'd seen my same IP numbers in other's posts. When it comes to online privacy and security, I'll always error on the side of caution.
IP cameras seem to operate like having to rewire your house, if you buy a different brand light bulb; or rejet your carburetor if you buy a different brand of gas. (yes, I'm old, I remember, and have worked on many, carburetors) There is little standardization.
My solution turned out to be, borrow a windows computer, (I use Linux) so we could install yet another program, to access the different camera, to change that one value.
Why do I have different brands of cameras you may ask? Because I need certain parameters, for different cameras, in different locations, and so far, I've not found any single brand to provide that. Would you want to go to a grocery store, and find only one brand, with limited choices? I think not, and that's where IP cameras are at. Flip side, they do offer some parameters, and advantages, coax cameras can not.
Good news is, with 16 cameras, I think I have it covered, now, to just upgrade the quality of some of those cameras....
Thank you to those who offered advice.