Customizing user-manager signup mail Subjet: with user login variable ...please help....

Hi everyboy.
I’m working on hotsot with usermanager and at last I need to put in the signup mail confirmation the user %login% variable in the subject field.
I’ve tried to put in the mail customizing page of user manager, the variables $login, $(login), %phone% , but nothing, it seems that the Usermanager not convert the variables.
I’ve googled around but I haven’t find anything.
May someone help me to find the way?
Thanks

Thanks for your tip, but already tried and nothing happens, it seems that for this field the system do not recognize variables.