Collavate allows users to upload a picture of their signature in order to digitally sign their processes. To do this, your domain administrator needs to turn this feature on by visiting the Admin Menu and adjusting the Signature setting to On under the Process tab.
Once this feature is on, go to your profile settings found at the top right of the page, under My Account. In the following page, Click the Settings tab and in this page you can upload either a .jpeg or .png of your digital signature. The optimal size of the photo you use for your signature should be 100(w)x80(h) pixel.
Now when you approve a file, your signature will appear next to your name in the Process popup and when converting the process to a .pdf it will also appear there.