Service allows to create almost any item anonymously.
However there is a restriction. Anonymously created items will be deleted in 24 hours.
You have several options how to make item you create permanent.
The simplest way is to create account and be signed in during item creation. Items created as signed in user will be hold in you personal profile and only you are able to control it.
If you created some item anonymously but later you want to own it there is a way to take ownership over anonymous item. However keep in mind that this feature available for all users. If for example you created item anonymously then any other user can take ownership over this item, not only you.
whenever you see this sign know that item will be auto deleted in 24 hours and ownership might be taken by someone else. Creating items anonymously is your own risk.