Now it is possible to put a campaign or several campaigns inside your signature wherever you like, not only at the bottom of your signature.
You can do this with adding in your signature a special field, which will contain the appropriate campaign id like this - ((campaign:1234)). With id you specify which campaign exactly you want to render in your signature.
When you open a campaign in the Campaigns section, you can find Campaign # id at the top of right hand menu. You should copy these digits and paste them in your campaign field. What should you get is ((campaign:4652)).
Then you should open your signature and paste the campaign field ((campaign:4652)) in your signature on that place you want your campaign be displayed.
Preview what you've got in your email. The campaign appeared in your signature on the place you pasted campaign id.
NOTE that only active campaigns will work with this solution. So before putting the field with campaign id in your signature verify if this campaign is enabled and active upon the schedule in your Xink account.