Hilario,
Currently there is not a mechanism specifically built to insert an image in the signature. However, you could use the second line of the credentials to contain the html to display the image. To do so, perform the following steps.
1) Upload your signature images.
1a) Go to Admin -> Report Templates
1b) Click the "Template Images..." button
1c) Right click on the root folder and choose "Add..."
1d) Select your image
1e) Press the upload button.
2) Edit your user's signature
2a) Go to Admin -> Users
2b) Double click on the user
2c) Select the "Preferences" tab
2d) For line 3, enter something like:
<img src="
https://web.onepacs.com:8443/onepacs/te ... nature.jpg"/>
2e) Save
3) Assure that your report template is displaying the token
3a) Admin -> Report Templates
3b) Click the "Template signature..." button.
3c) Assure that the Author credentials 2 token ($AUTHOR_CREDENTIALS_2) is part of the template.
Let me know if this works.
Thanks,
Justin