Want to turn mermaid back to human. Please help!!!

Changing Back to Normal
If you no longer wish to be a Mermaid, simply avoid swimming for about four days. A couple days in, a moodlet will appear telling you that the Sim is 'Adaping to Land'. When this expires, the Sim will revert back to a normal Sim. Potent Cure Elixir will also work to return a Sim to normal. When your Sim loses his or her Mermaid abilities, they will still keep the level 10 Scuba Diving skill experience they earned during the transformation.