When someone misspaces something, they put it in the wrong place and can't find it.
If someone misspaces something, it can be frustrating because they have to look for it.
Examples:
She misspaces her keys and can't find them.
I always misspaces my socks and then I can't find them.
He misspaces his toy under the bed.
The cat misspaces its toy and then looks for it everywhere.
She misspaces her homework and has to look for it all over the house.
The dog misspaces its bone and then sniffs around to find it.