Which camera problem do you mean?
If you mean you can't find the shower to place the first camera: See this
#27,297, which links to advice available for over a year.
If you mean you've placed all three cameras and can't complete: This was posted 2 pages back
#28,276 pointing to the same advice available for at least 6 months and in some similar form for over a year.
If you don't mean either of those - please be more specific and also state what you have attempted so we aren't repeating the same stuff over and over again.
Also, if you haven't already done so, make sure to create a save regimen rotating through 3-7 save slots (there are 161 available slots to use!) where you save every night the MC goes to his bedroom or a similar repetitive time. That way if you run into some of the bugs that may still and most likely could pop up for some players while this game continues in development, you don't have to step back to far in progress to redo some steps to get past a possible bug.