One Stroke Script  Suggested by rocamaco 

Well, the font is "One Stroke Script" but the tilde doesn't belong to its charset...

It's because they used ’ and not '

If you copy and paste It’s simple into the MyFonts sample text field you get it, so you're right it's the good font

OK, thanks for the information, every day I learned something new here...

That's what I like it...

thank you very much!