How to post on activity as 'Anonymous' user on Buddypress.

When an user sends a public message to someone or in activity it says

`User1 , posted an update 6 days, 22 hours ago @user2 my message' .

I want to havea dropdown where it will say if I want to post as my username or as an Anonymous user. Currently it just post with the UserName you have. I created an user called ' Anonymous' but I don´t know how to go forward from here.

Can anyone help? :slight_frown:

Thank you
Tirtha

PS: I am aware of the plugin called 'BuddyPress Anonymous Activity plugin ' . I wanted to know if it can be done without the help of the plugin. :slight_smile: