hi Hon - below is the code I use for mine...if you replace the URL between the "'s with yours leaving the " in place, and Name it whatever you like where mine says "my new pregnancy journal", then remove the two *'s ive put it... copy and paste into your edit signature tab in the control panel... and hopefully that should be it!
[URL="https://www.babyandbump.com/pregnancy-journals/371537-shhhhh-mushmellows-growing.html"*]My New Pregnancy Journal[/URL*]