Hi Kristi! You may have lost the threads because you were looking at them under "New Posts" and when you left the threads, you had already seen them (they weren't "new" anymore) so you'd have to go into the section they were in and find them there.
It is a little confusing, especially cause the board's so big lol, but you'll figure it out! and you can feel free to PM me if you have any questions/concerns/emotional outbursts, etc.
Welcome to YT!