First, you will need a yo-yo. Any kind will do fine.
If the string is too big, you'll have to tie it.
This is what your hand should look like as you let it down (and the same for when you bring it up)
If this happened to you, then here is how you wind your yo-yo up for use again:
And that's the basics of using a yo-yo! Feel free to ask me any questions. Thanks for viewing, hope it helped!