Current Spark on Android does not include an HTML button. Create the signature in Spark on a Mac, Windows PC or iPhone, signed in with the same Spark account, and it syncs here.
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Create it where Spark has an HTML button
Follow the Spark for Mac guide, or the Spark on iPhone guide. Use the same Spark account on this phone.
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Set it as the default on Android
- Open Spark, tap the menu → Settings → Signatures, and turn on Use Email Signatures.
- If the signature is already in the list, open Settings → Mail accounts, choose the account, then Default Signature.
- If the editor on your phone shows an HTML button, you can paste the code there instead. Current Spark help does not include that button on Android.
Compose a new email to check it.