If your Scribe email signature doesn't show up in your email after installation make sure to refresh your email provider to see the changes.
If you are using a third-party app on your email provider such as Mixmax it might be the issue. We developed a Mixmax integration for Scribe. You can find it on your setting tab.
If you are copy-pasting the HTML code of your signature to install it do not use Safari. Any other browser works.
For Gmail users make sure your settings in Gmail are not bypassing the Scribe signature
If it's active, make sure to disable the Plain Text option.