Go to Emails > Go to Edit Email templates > Click Tools > Select Source Code
2. Copy & Paste your own HTML file or Adjust the excisting one to your preference.
3. Click Ok and Save the email
4. Update this for all wished templates.
5 A. Note check also the email signature and update this one if needed.
> Go to Guide > Edit Event info > scroll down for Email Signature > Tools > Sourcecode.> update & scroll down the page to Save.
(5 B. Optional: Remove the MergeTag [event.email_signature] in the emails completely, if so do add the sentence in your own email templates:
" Click here if you are not attending [event.name] anymore and unseat yourself from all sessions." )