-you can remove (hide) your online status in "whatsapp" by the following steps:
1.Open "whatsapp" application.
2.In the upper right hand corner, click on the three vertical dots.
3.Then tap on "settings".
4.From the settings menu, select "account".
5.Next,tap on "privacy".
6.Choose "last seen" from the list of options.
7.In the pop-up window choose "No body".