Note: Make sure you use Google Chrome or Firefox during installation.
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Create your email signature on MySignature.io and follow these simple steps to install it in Thunderbird:

Step 1.
​After creating your email signature, click Save signature button under the signature preview.

Or, if you have saved your signature, find your signature on the Dashboard and click Install button.
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​Step 2.
​Next, click Copy to clipboard button.
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Or, select the Source code in the list of email clients and click Copy source code button.
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​Step 3.
​In Spark > click Spark >Preferences.
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​Step 4.
​Choose the Signatures sub-menu. Then click the + icon to add a new signature.
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​Step 5.
​If you copied your signature by clicking Copy to clipboard, paste the copied signature into the Signature box and choose an email account to which it should be added.
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Or, if you copied the source code of your signature, click HTML button on the top right corner and paste the source code of the signature into the Signature box (the keyboard shortcut for paste on Mac - Command+V).
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If you paste the source code to the Signature box, click HTML button once again to preview your email signature.
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​Note: The option "Always match my default message font" should be unchecked to keep the original formatting.
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Close the window. Then compose a new message to see your signature in action.
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Do you have other questions? Please reach out to our Support Team via live chat or email.