how to boot into other w10 in a dual w10 ssd

[mell0]

I have two w10 os on one ssd and I apparently wrote some information wrong so I need to go to the other w10 boot but I have no options presented to me upon restart. I really need to get into the other w10 partition. plz help

 

[popatim]

If your don't see it in 'Computer' run Diskmgmt.msc and you may just need to assign it a drive letter.
If this was an actual boot drive then it was C: which naturally can't be assign to it because your current boot drive is C: so windows just doesn't give it a new one.