email signature

hi ,

i have Microsoft  dynamic crm 2015 online - and i added a new template of signature for the e- mails that i send from the crm .

the problem is that i cant find how i can make my template signature to default  .

i want that every time i am sending emails from the crm- it's will automatic put my signature in the body of the mail - just like in outlook/gmail ...

please help me :)

many thanks !